S’mores Chocolate Mud Cake
This S'mores Chocolate Mud Cake is the most indulgent and irresistible s'mores inspired dessert you will ever make. It starts with a golden and buttery graham cracker crust on the bottom that adds the most satisfying crunch, then topped with a rich and decadent classic chocolate cake that is incredibly soft, moist, and perfectly tender throughout every single bite. Once baked, marshmallow fluff is piped throughout the cake for the most dreamy and gooey s'mores surprise inside, then finished with a layer of velvety chocolate ganache on top — served warm with a scoop of vanilla ice cream for the ultimate indulgent s'mores dessert experience!
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Ingredients You Need:
Full ingredients and recipe are in the recipe card below. Read through this section for all the ingredients substitution and baking tips!
Graham Cracker Crumbs: The base of the golden and buttery graham cracker crust that adds that classic s'mores crunch and warm, slightly honeyed flavor to the bottom of every single slice — mixed with melted butter and pressed into a firm and even disc that bakes up perfectly golden and holds together beautifully throughout.
Salted Butter: Melted into the graham cracker crumbs to bind them together and create a rich, buttery, and perfectly crunchy crust that holds its shape beautifully beneath the rich and decadent chocolate cake throughout every single slice.
All-Purpose Flour: The base of the rich and decadent chocolate cake layer that provides structure while keeping the crumb incredibly soft, moist, and perfectly tender throughout every single slice.
Granulated Sugar: Sweetens the chocolate cake batter to a perfectly balanced and indulgent finish that enhances the deep rich chocolate flavor and keeps the crumb incredibly moist and tender throughout.
Dutch-Process Cocoa Powder: Adds the deepest, richest, and most intensely chocolatey flavor to the chocolate cake layer — dutch-process is strongly recommended for the best dark, moist, and decadent result that pairs absolutely beautifully with the graham cracker crust and marshmallow fluff filling throughout.
Baking Soda: Reacts with the acidic buttermilk in the chocolate cake batter to help the cake rise and stay soft, moist, and perfectly tender with a beautiful, even crumb throughout.
Baking Powder: Works alongside the baking soda to give the chocolate cake the perfect lift and ensures a beautifully domed and evenly risen cake throughout.
Salt: Balances the sweetness and enhances all the deep rich chocolate and warm s'mores flavors throughout the graham cracker crust, chocolate cake, and velvety chocolate ganache.
Buttermilk: Adds moisture and a subtle tang to the chocolate cake batter that keeps the crumb incredibly soft, moist, and perfectly tender throughout — a splash of apple cider vinegar or lemon juice mixed with milk of choice works as a substitute.
Avocado Oil: Added to the chocolate cake batter for extra moisture that keeps the crumb incredibly soft, moist, and perfectly tender for days — any neutral oil of choice works as a substitute throughout.
Eggs: Provide structure, richness, and stability to the chocolate cake batter while helping the cake rise and hold together properly during baking throughout.
Vanilla Bean Paste or Extract: Adds a warm, sweet, and aromatic flavor that enhances the deep rich chocolate and classic s'mores flavors throughout the chocolate cake layer.
Hot Coffee or Espresso: The secret ingredient that enhances and deepens the rich chocolate flavor throughout the cake without adding a noticeable coffee taste — it also thins the thick batter to the perfect pourable consistency and creates the most incredibly moist and tender chocolate crumb throughout. Hot water works as a substitute.
Marshmallow Fluff or Creme: The dreamy and gooey star of the marshmallow filling — piped into holes poked throughout the warm chocolate cake for the most indulgent and irresistible s'mores surprise in every single bite. Store-bought or homemade both work beautifully throughout.
Dark Chocolate: The base of the smooth, rich, and velvety chocolate ganache — dark chocolate chips or a chopped dark chocolate bar melted together with hot heavy cream for the most deeply chocolatey and beautifully glossy ganache that coats the top of the cake perfectly throughout.
Heavy Cream: Heated and poured over the dark chocolate to create a smooth, silky, and perfectly pourable velvety chocolate ganache that melts beautifully over the top of the cake for the most indulgent and irresistible s'mores finishing touch throughout.
Why You’ll Love S’mores Chocolate Mud Cake:
Golden And Buttery Graham Cracker Crust: The golden and buttery graham cracker crust on the bottom adds the most satisfying crunch and that classic s'mores flavor that pairs absolutely beautifully with the rich and decadent chocolate cake and gooey marshmallow fluff throughout every single bite.
Rich And Decadent Chocolate Cake Layer: The chocolate cake layer is incredibly soft, moist, and perfectly tender with a rich and deeply chocolatey crumb that melts right in your mouth with every single bite — absolutely irresistible from the very first slice to the very last.
Dreamy Marshmallow Fluff Filling: Marshmallow fluff piped throughout the warm cake creates the most dreamy, gooey, and incredibly indulgent s'mores surprise in every single bite that makes this mud cake truly one of a kind and completely unforgettable.
Velvety Chocolate Ganache Layer: A smooth and velvety chocolate ganache layer on top adds the most rich, deeply chocolatey, and beautifully glossy finishing touch that ties all the classic s'mores flavors together perfectly throughout every single slice.
Classic S'mores Flavor In Every Bite: Every single element of a classic s'mores — buttery graham cracker, rich chocolate, and dreamy marshmallow — comes together in the most perfectly layered and absolutely irresistible mud cake form throughout.
Served Warm For The Most Indulgent Experience: This mud cake is at its absolute best served warm straight from the oven with the marshmallow fluff still gooey and the chocolate ganache perfectly melty — a scoop of vanilla ice cream melting over the top takes every single bite completely over the top.
The Ultimate S'mores Inspired Dessert: This s'mores chocolate mud cake is the most indulgent, impressive, and completely irresistible s'mores inspired dessert that looks and tastes like it came straight from a high-end bakery but is made completely from scratch right in your own kitchen.
Perfect For Any Occasion: Whether it is a summer gathering, a dinner party dessert, a holiday celebration, or any time a s'mores craving hits, this s'mores chocolate mud cake is always the ultimate showstopper on the dessert table.
Tips for Making S’mores Chocolate Mud Cake:
Use A Springform Pan — Not A Regular Cake Pan: A 9" springform pan or cheesecake pan is essential for this recipe — a regular 9" cake pan is too shallow and the batter will spill over in the oven while baking. Do not substitute with a regular cake pan for the best and safest result throughout.
Line The Bottom With Parchment Paper: Make sure to line the bottom of the greased springform pan with a parchment paper circle before adding the graham cracker crust — this makes it much easier to remove the cake cleanly and transfer it to a serving plate without the crust crumbling or sticking throughout.
Press The Graham Cracker Crust Into A Tight Even Layer: Use the bottom of a small measuring cup, ramekin, or cup to press the graham cracker crust mixture down firmly into a tight and even layer — a well-packed crust holds together beautifully when sliced and gives the most satisfying crunch in every single bite.
Do Not Press The Crust Up The Sides: Keep the graham cracker crust flat like one giant hockey puck or disc at the bottom of the pan — do not press it up the sides as this is what creates that beautiful distinct bottom layer throughout every single slice.
Pre-Bake The Graham Cracker Crust: Bake the graham cracker crust at 350F for 10–12 minutes before adding the chocolate cake batter — pre-baking sets the crust and ensures it stays perfectly firm and crunchy beneath the rich and moist chocolate cake throughout.
Reduce The Oven Temperature After Baking The Crust: After pre-baking the crust, reduce the oven temperature from 350F to 325F before baking the chocolate cake — the lower temperature ensures the cake bakes slowly and evenly without over-browning the top or drying out the rich and tender crumb throughout.
Use Dutch-Process Cocoa Powder: Dutch-process cocoa powder is strongly recommended for the deepest, richest, and most intensely chocolatey flavor in the chocolate cake layer — regular unsweetened cocoa powder works as a substitute but dutch-process gives the best dark, moist, and decadent result throughout.
Use Room Temperature Ingredients: Buttermilk and eggs should be at room temperature so they incorporate evenly into the cake batter for the smoothest, most consistent result throughout.
Don't Be Alarmed By The Thick Batter: After combining the dry and wet ingredients the batter will be very thick — similar to brownie batter — and that is completely normal. Adding the hot coffee at the end is what thins it out to the perfect pourable consistency throughout.
Add The Hot Coffee While Stirring Quickly: Pour the hot coffee into the thick batter and stir quickly until well combined — the batter will become very thin after adding the hot coffee and that is completely intentional. The hot coffee enhances the deep chocolate flavor and creates the most incredibly moist and tender crumb throughout.
Use Fresh Brewed Hot Coffee Or Espresso: Hot freshly brewed coffee or espresso is strongly recommended for the deepest and most intensely chocolatey flavor throughout — hot water works as a substitute but coffee takes the chocolate flavor completely over the top without adding a noticeable coffee taste throughout.
Pour The Batter Gently Over The Pre-Baked Crust: Pour the thin chocolate cake batter gently and evenly over the pre-baked graham cracker crust — pouring gently prevents the crust from shifting or breaking up and ensures beautiful distinct layers throughout every single slice.
Bake Low And Slow For The Best Result: Baking the cake at 325F for 60–70 minutes ensures the cake bakes all the way through slowly and evenly without over-browning the top or drying out the rich and moist crumb — do not rush this step for the best mud cake result throughout.
Check For Doneness With A Toothpick: The cake is done when a toothpick inserted into the middle comes out clean or with just a few moist crumbs — start checking at the 60 minute mark and continue baking in 5 minute increments if needed throughout.
Cool To Your Preferred Consistency Before Filling: For a slightly melty and gooey marshmallow filling, pipe the marshmallow fluff into the cake when it is almost completely cooled — for a firmer and more defined marshmallow filling, wait until the cake is fully cooled before piping throughout.
Poke Holes Deep Enough For The Marshmallow Fluff: Use a skewer, fork, or the end of a wooden spoon to poke holes deep enough throughout the surface of the cake — deep holes give the marshmallow fluff enough room to fill the center of the cake and create that dreamy gooey surprise in every single bite.
Pipe The Marshmallow Fluff Until It Reaches The Top: When piping the marshmallow fluff into each hole, pipe until it just reaches the top of the cake — this ensures every single slice is packed with the most gooey and dreamy marshmallow filling throughout.
Pour The Chocolate Ganache While Still Slightly Warm: Pour the chocolate ganache over the surface of the cake while it is still slightly warm and pourable — this creates the most beautiful velvety and glossy finish that coats the top of the cake perfectly throughout.
Reserve Some Ganache For Serving: Set aside some of the chocolate ganache before pouring over the cake to drizzle over individual slices when serving — an extra drizzle of warm chocolate ganache over the vanilla ice cream takes every single bite completely over the top throughout.
Release From The Springform Pan Before Filling: Release the cake from the springform pan ring while keeping it on the bottom disc and place it onto a baking sheet before poking holes and filling — this makes it much easier to fill, coat, and transfer to a serving plate without damaging the graham cracker crust throughout.
How to Store S’mores Chocolate Mud Cake:
Best Served Fresh: This s'mores chocolate mud cake is at its absolute best served warm and fresh the day it is made with the marshmallow fluff still gooey, the chocolate ganache perfectly velvety, and a scoop of vanilla ice cream melting over the top for the ultimate indulgent s'mores dessert experience.
Room Temperature (Short-Term): Store the cake covered at room temperature for up to 1 day. The marshmallow fluff filling will firm up slightly as it cools but the cake will still be incredibly moist, rich, and delicious throughout.
Refrigerator: Store leftover cake covered or in an airtight container in the refrigerator for up to 4 days. The chocolate ganache will firm up in the refrigerator so reheating before serving is recommended for the best warm, gooey, and velvety result throughout.
To Reheat: Warm individual slices in the microwave for 20–30 seconds until warmed through and the marshmallow fluff is gooey again and the chocolate ganache is perfectly melty — this brings back that fresh-from-the-oven indulgent texture and flavor beautifully throughout.
Make Ahead (Graham Cracker Crust): The graham cracker crust can be pre-baked up to 1 day in advance and stored covered at room temperature until ready to add the chocolate cake batter — this is a great way to save time the day of baking throughout.
Make Ahead (Chocolate Ganache): The chocolate ganache can be made in advance and stored in an airtight container in the refrigerator for up to 1 week. Gently reheat in the microwave at 20-second intervals, stirring in between, until smooth and perfectly pourable before coating the cake.
Make Ahead (Whole Cake Without Filling And Ganache): The chocolate cake can be baked up to 1 day in advance and stored covered at room temperature. When ready to serve, pipe the marshmallow fluff filling and pour the chocolate ganache over the top right before serving for the freshest and most indulgent result throughout.
Freezer: Freeze individual slices of the cake without the marshmallow fluff and chocolate ganache in a freezer-safe bag or container for up to 2 months. Thaw overnight in the refrigerator, bring to room temperature, pipe with fresh marshmallow fluff, and coat with a fresh batch of chocolate ganache before serving for the best result throughout.
Storing The Chocolate Ganache Separately: Store any leftover chocolate ganache in an airtight container in the refrigerator for up to 1 week — it is also incredible drizzled over ice cream, brownies, or any other chocolate dessert for an extra indulgent finishing touch throughout.
FAQs:
Q: Can I make this s'mores chocolate mud cake ahead of time?
A: Yes. The graham cracker crust can be pre-baked up to 1 day in advance and the chocolate cake can be baked up to 1 day in advance and stored covered at room temperature. When ready to serve, pipe the marshmallow fluff filling and pour the chocolate ganache over the top right before serving for the freshest and most indulgent result.
Q: Can I use homemade marshmallow fluff instead of store-bought?
A: Yes. Homemade marshmallow fluff or creme works beautifully as a substitute for store-bought — simply transfer it to a piping bag and pipe into the holes as directed for the same dreamy and gooey marshmallow filling throughout every single slice.
Q: Why do I need to use a springform pan instead of a regular cake pan?
A: A regular 9" cake pan is too shallow for this recipe and the batter will spill over in the oven while baking — a 9" springform pan or cheesecake pan is essential for the best and safest result. The springform pan also makes it much easier to release and transfer the cake to a serving plate without damaging the graham cracker crust throughout.
Q: Can I use regular cocoa powder instead of dutch-process?
A: Yes. Regular unsweetened cocoa powder works as a substitute for dutch-process cocoa powder throughout. Keep in mind that dutch-process gives the deepest, richest, and most intensely chocolatey flavor so it is recommended to use it if possible for the best dark, moist, and decadent result throughout.
Q: Can I substitute the buttermilk in the cake batter?
A: Yes. Mix 1 tablespoon of apple cider vinegar or lemon juice with 1 cup of milk of choice as a substitute. The buttermilk adds a subtle tang and helps create a light, moist, and perfectly tender crumb so it is recommended to use it if possible throughout.
Q: Why do I add hot coffee to the chocolate cake batter?
A: The hot coffee enhances and deepens the rich chocolate flavor throughout the cake without adding a noticeable coffee taste — it also thins the thick batter to the perfect pourable consistency and creates the most incredibly moist and tender chocolate crumb throughout. Hot water works as a substitute but coffee gives the best result.
Q: When should I pipe the marshmallow fluff into the cake?
A: For a slightly melty and gooey marshmallow filling pipe the marshmallow fluff when the cake is almost completely cooled — for a firmer and more defined marshmallow filling wait until the cake is fully cooled before piping. Both options are equally delicious and completely up to personal preference throughout.
Q: Can I use milk chocolate instead of dark chocolate for the ganache?
A: Yes. Any chocolate of choice works beautifully for the ganache — milk chocolate, semi-sweet, or dark chocolate all work well and pair beautifully with the graham cracker crust, moist chocolate cake, and gooey marshmallow fluff filling throughout.
Q: How do I know when the cake is done baking?
A: The cake is done when a toothpick inserted into the middle comes out clean or with just a few moist crumbs — start checking at the 60 minute mark and continue baking in 5 minute increments if needed. The top should look set and the edges should be pulling away slightly from the sides of the pan throughout.
Q: Can I freeze this cake?
A: Yes. Freeze individual slices of the cake without the marshmallow fluff and chocolate ganache in a freezer-safe bag or container for up to 2 months. Thaw overnight in the refrigerator, bring to room temperature, pipe with fresh marshmallow fluff, and coat with a fresh batch of chocolate ganache before serving for the best result throughout.
Love this? Check out my other cake recipes:
Make sure to tag me @wellmadebykiley on Instagram and leave a review or comment if you make this s’mores chocolate mud cake. Happy baking!
