Peanut Butter S’mores Oatmeal Cookie Skillet (with Brown Butter)
This Peanut Butter S'mores Oatmeal Cookie Skillet is soft, warm, and gooey in the middle with perfectly golden, crisp, and chewy edges throughout. The brown butter adds a deep, nutty richness that pairs beautifully with the peanut butter flavor, while melty pockets of chocolate, gooey toasty marshmallows, and crushed graham crackers make every single bite feel like the ultimate campfire treat. Served warm with a scoop of vanilla ice cream and a sprinkle of flaky sea salt — this skillet cookie is the ultimate cozy dessert you'll want to make on repeat.
If you try out this recipe, I’d love to see it! Leave a comment with a star rating below and tag @wellmadebykiley on Instagram and hashtag it #wellmadebykiley
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!
Salted Butter: Browned until deep golden amber and nutty for a rich, warm depth of flavor that takes this peanut butter s'mores oatmeal cookie skillet completely over the top.
Brown Sugar: Adds a deep, molasses-like sweetness and helps create that perfectly soft, chewy, and gooey texture throughout the cookie skillet.
Granulated Sugar: Balances the sweetness and helps create those perfectly golden, slightly crisp edges that make every bite so irresistible.
Creamy Peanut Butter: The star flavor of this cookie skillet — creamy peanut butter adds a rich, nutty flavor that pairs beautifully with the brown butter, chocolate, and s'mores flavors throughout.
Eggs: Provide structure, richness, and stability to the cookie dough while helping the skillet cookie bake up soft, gooey, and perfectly set throughout.
Heavy Cream: Adds a subtle richness and moisture to the cookie dough that keeps the skillet cookie incredibly soft and tender on the inside — milk of choice works as a substitute.
Vanilla Extract: Adds a warm, sweet, and aromatic flavor that enhances all the rich, indulgent flavors throughout the cookie skillet.
All-Purpose Flour: Provides the structure and base of the cookie dough while keeping the skillet cookie soft, tender, and perfectly gooey in the center.
Old-Fashioned Rolled Oats: Add a hearty, chewy texture and a subtle nuttiness that pairs beautifully with the peanut butter and brown butter flavors throughout every bite.
Baking Soda: Helps the cookie skillet rise and spread evenly while keeping the center soft and gooey and the edges perfectly golden and crisp.
Baking Powder: Works alongside the baking soda to give the cookie skillet the perfect lift and texture throughout.
Salt: Balances the sweetness and enhances all the rich, warm flavors of the brown butter, peanut butter, chocolate, and s'mores ingredients throughout.
Semi-Sweet Chocolate Chips: Folded into the dough for melty pockets of rich, bittersweet chocolate throughout every bite that pairs perfectly with the peanut butter and s'mores flavors.
Chopped Hershey's Milk Chocolate Bar: Chopped into uneven pieces and folded into the dough alongside the chocolate chips for larger, more indulgent pools of melty milk chocolate in every single bite.
Graham Crackers: Crushed into the dough for that classic s'mores flavor and a subtle crunch throughout — also broken into bite-size pieces and layered into the skillet for extra s'mores goodness in every bite.
Marshmallows: Layered inside and on top of the cookie skillet for gooey, toasty, and perfectly melted marshmallows that create that signature campfire s'mores experience in every single bite.
Vanilla Ice Cream: The perfect finishing touch — a scoop of vanilla ice cream melting over the warm, gooey cookie skillet creates the ultimate contrast of warm and cold in every bite.
Flaky Sea Salt: A generous sprinkle of flaky sea salt over the warm cookie skillet balances all the rich, sweet flavors and takes every single bite completely over the top.
Why You’ll Love a Peanut Butter S’mores Oatmeal Cookie Skillet (w/ Brown Butter):
Soft, Warm, And Gooey In The Middle: This skillet cookie is incredibly soft and gooey in the center with a warm, melt-in-your-mouth interior that makes every single bite absolutely irresistible.
Perfectly Golden, Crisp, And Chewy Edges: The edges of the skillet cookie bake up perfectly golden, slightly crisp, and delightfully chewy for the most satisfying texture contrast with the soft, gooey center.
That Deep Brown Butter Richness: The brown butter adds a warm, nutty depth of flavor that takes this skillet cookie completely over the top and pairs beautifully with the peanut butter throughout.
Melty Pockets Of Chocolate: Rich, melty chocolate is studded throughout every bite for an indulgent, gooey burst of chocolate flavor that pairs perfectly with the peanut butter and s'mores flavors.
Gooey Toasty Marshmallows: Soft, gooey, and perfectly toasted marshmallows are scattered throughout for that signature s'mores flavor and texture that makes every bite feel like a campfire treat.
Crushed Graham Crackers In Every Bite: Crushed graham crackers add a subtle crunch and that classic s'mores flavor that ties everything together beautifully in every single bite.
Served Warm With Vanilla Ice Cream: A scoop of vanilla ice cream melting over the warm, gooey skillet cookie is the ultimate finishing touch that makes this dessert truly irresistible.
The Ultimate Cozy Dessert: This skillet cookie is the definition of comfort food — warm, indulgent, and deeply satisfying whether you're serving it for a crowd or enjoying it on a cozy night in.
Tips for Making a Peanut Butter S’mores Oatmeal Cookie Skillet (w/ Brown Butter):
Brown The Butter First: Brown the butter before starting anything else so it has time to cool slightly before adding it to the sugars — hot brown butter can melt the sugars and affect the texture of the dough.
Watch The Brown Butter Closely: Butter can go from perfectly browned to burnt very quickly, so stay at the stove and stir continuously until it turns a deep golden amber color and smells nutty. Remove from the heat immediately.
Let The Brown Butter Cool: Allow the brown butter to cool for about 15–20 minutes before adding the sugars — it should be warm but not hot to the touch so it doesn't melt the sugars when combined.
Use Room Temperature Ingredients: Eggs and heavy cream should be at room temperature so they incorporate evenly into the dough for the best texture and consistency.
Use Creamy Peanut Butter: Creamy peanut butter works best in this recipe for a smooth, even dough — avoid natural peanut butter as the separated oils can affect the texture of the skillet cookie.
Don't Overmix The Dough: Fold the dry ingredients into the wet until just combined — overmixing will result in a denser, tougher skillet cookie rather than a soft, gooey, and chewy result.
Use Both Chocolate Chips And Chopped Chocolate: The combination of semi-sweet chocolate chips and chopped Hershey's milk chocolate bar creates the best melty pockets of chocolate throughout — chopped chocolate melts into larger, more indulgent pools of chocolate in every bite.
Layer The Marshmallows And Graham Crackers In The Middle: Pressing the graham cracker pieces and marshmallows between the two layers of dough ensures they are gooey, melty, and perfectly toasted throughout the inside of the skillet cookie.
Grease The Skillet Well: Make sure to grease the cast iron skillet generously with butter before adding the dough to prevent sticking and to help create those perfectly golden, crisp edges.
Press The Dough Into An Even Layer: Make sure the first layer of dough is pressed into an even layer before adding the marshmallows and graham crackers — this ensures the skillet cookie bakes evenly throughout.
Don't Fully Cover The Top Marshmallows: It's completely okay if the marshmallows on top aren't fully covered by the dough — they will toast up beautifully in the oven and create that signature gooey, golden s'mores topping.
Look For Golden Edges And A Slightly Gooey Center: The skillet cookie is done when the edges are golden brown and the center has puffed but is still slightly gooey — do not overbake or the center will lose that signature soft, gooey texture.
Add Extra Chocolate On Top After Baking: Place a few extra chocolate chips and Hershey's milk chocolate pieces on top right after removing from the oven to get them perfectly melty and gooey before serving.
Let It Rest Before Serving: Allow the skillet cookie to cool for at least 10 minutes before serving — this helps it set up slightly and makes it much easier to scoop and serve.
Serve Warm With Vanilla Ice Cream And Flaky Sea Salt: This skillet cookie is at its absolute best served warm straight from the oven with a scoop of vanilla ice cream melting over the top and a generous sprinkle of flaky sea salt to balance all the rich, sweet flavors.
How to Store a Peanut Butter S’mores Oatmeal Cookie Skillet (w/ Brown Butter):
Best Served Fresh: This peanut butter s'mores oatmeal cookie skillet is at its absolute best served warm and fresh straight from the oven with a scoop of vanilla ice cream and a sprinkle of flaky sea salt.
Room Temperature (Short-Term): The cookie skillet can sit covered at room temperature for up to 2 days. The center will firm up slightly as it cools but will still be deliciously chewy and flavorful.
Refrigerator: Store leftover cookie skillet covered or in an airtight container in the refrigerator for up to 4 days. The texture will firm up in the refrigerator so reheating before serving is recommended.
Freezer: Freeze individual portions of the cooled cookie skillet in a freezer-safe bag or container for up to 2 months. Thaw overnight in the refrigerator before reheating.
To Reheat: Warm individual portions in the microwave for 20–30 seconds until warmed through and the chocolate and marshmallows are melty again, or reheat in the oven at 325F for 8–10 minutes for the best soft, gooey texture.
To Serve From Cold: Let refrigerated portions sit at room temperature for 10–15 minutes before reheating for the most even warmth throughout and the best gooey texture.
FAQs:
Q: Can I make this peanut butter s'mores oatmeal cookie skillet ahead of time?
A: Yes. The cookie dough can be prepared and stored covered in the refrigerator for up to 24 hours before assembling and baking. When ready to bake, assemble in the skillet and bake as directed.
Q: Can I use a different type of skillet or pan?
A: Yes. Any 12" oven-safe skillet works well for this recipe. You can also bake it in a greased 9x13" baking pan, though the baking time may vary slightly so keep a close eye on the edges and center.
Q: Can I use natural peanut butter?
A: Natural peanut butter is not recommended for this recipe as the separated oils can affect the texture and consistency of the cookie dough. Creamy store-bought peanut butter gives the best results.
Q: Can I use a different type of chocolate?
A: Yes. Any chocolate of choice works well in this recipe. The combination of semi-sweet chocolate chips and chopped Hershey's milk chocolate bar is recommended for the best melty, indulgent pockets of chocolate throughout.
Q: Can I use mini marshmallows instead of regular marshmallows?
A: Yes. Mini marshmallows work well as a substitute and will distribute more evenly throughout the skillet cookie. Use as many or as few as you prefer depending on your marshmallow preference.
Q: How do I know when the skillet cookie is done?
A: The skillet cookie is done when the edges are golden brown and the center has puffed but still has a slight gooey jiggle when shaken. Do not overbake — the center will continue to set as it cools.
Q: Can I double this recipe?
A: Yes. You can double the recipe and bake it in two separate 12" skillets or in a larger baking pan. Adjust the baking time as needed and keep a close eye on the edges and center for doneness.
Q: Can I freeze this cookie skillet?
A: Yes. Freeze individual portions of the cooled cookie skillet in a freezer-safe bag or container for up to 2 months. Thaw overnight in the refrigerator and reheat in the microwave or oven before serving.
Q: Do I have to serve this with vanilla ice cream?
A: You don't have to, but it is highly recommended. A scoop of vanilla ice cream melting over the warm, gooey skillet cookie creates the ultimate contrast of warm and cold that makes every bite completely irresistible.
Love these? Check out my other cookie recipes:
Make sure to tag me @wellmadebykiley on Instagram and leave a review or comment if you make this peanut butter s’mores oatmeal cookie skillet (with brown butter). Happy baking!
