If you’re a fan of desserts that combine the best of two worlds, then you’ll fall head over heels for Oatmeal Cookie Smores Bars. These delightful treats mash up the classic flavors of gooey s’mores with the comforting chewiness of oatmeal cookies. With a rich layer of marshmallow creme and melty chocolate sandwiched between hearty oats, these bars are perfect for any occasion, whether it’s a summer barbecue or an afternoon snack. The combination of textures and flavors is simply irresistible!
Why Cooks Rave About It

Oatmeal Cookie Smores Bars are a hit for several reasons. First, they’re incredibly easy to make, requiring no fancy techniques or specialized equipment. Second, they bring together the nostalgic flavors of childhood s’mores with the wholesome goodness of oatmeal cookies. Lastly, they’re a crowd-pleaser—everyone from kids to adults will enjoy these decadent bars. Each bite is a delightful mix of chewy oats, creamy marshmallow, and rich chocolate, making them the perfect treat for sharing.
What You’ll Need
To whip up these scrumptious Oatmeal Cookie Smores Bars, gather the following ingredients:
- 1 cup (113g) unsalted butter, softened
- 1 cup (200g) brown sugar, packed
- 1 large egg
- 1 teaspoon vanilla extract
- 1 teaspoon baking soda
- 1/2 teaspoon salt
- 1 1/2 cups (155g) all-purpose flour
- 1 1/2 cups (128g) quick cooking oats
- 17 ounce jar marshmallow creme
- 1 cup (170g) chocolate chips (milk or semi-sweet)
Must-Have Equipment
Before you start baking, make sure you have the right tools on hand:
- Mixing bowl: For combining your ingredients.
- 9×13 inch baking pan: The perfect size for these bars.
- Spatula: Useful for spreading the batter and layering the marshmallow creme.
- Measuring cups and spoons: To ensure accurate ingredient amounts.
- Oven mitts: To keep your hands safe while handling hot dishes.
Method: Oatmeal Cookie Smores Bars

Step 1: Preheat Your Oven
Preheat your oven to 350°F (175°C). This will ensure that your Oatmeal Cookie Smores Bars bake evenly.
Step 2: Prepare the Baking Pan
Grease a 9×13 inch baking pan with butter or line it with parchment paper for easy removal once the bars are baked.
Step 3: Cream the Butter and Sugar
In a large mixing bowl, cream together the softened unsalted butter and packed brown sugar until the mixture is light and fluffy. This should take about 2-3 minutes using an electric mixer.
Step 4: Add the Egg and Vanilla
Beat in the large egg and vanilla extract until well combined, ensuring everything is blended smoothly.
Step 5: Mix Dry Ingredients
In a separate bowl, whisk together the baking soda, salt, all-purpose flour, and quick cooking oats until evenly mixed.
Step 6: Combine Wet and Dry Ingredients
Gradually add the dry ingredients to the wet mixture, stirring until just combined. Be careful not to overmix; you want a thick, chewy dough.
Step 7: Layer the Ingredients
Spread half of the oatmeal cookie dough evenly in the prepared baking pan. Use a spatula to create an even layer.
Step 8: Add Marshmallow Creme and Chocolate
Spread the entire jar of marshmallow creme over the first layer of dough. Sprinkle the chocolate chips evenly on top of the marshmallow.
Step 9: Top with Remaining Dough
Dollop the remaining oatmeal cookie dough on top of the marshmallow and chocolate layers. It’s okay if it doesn’t cover everything completely; just spread it out as best as you can.
Step 10: Bake
Place the baking pan in the preheated oven and bake for 25-30 minutes, or until the edges are golden brown and the center looks set.
Step 11: Cool and Slice
Once baked, remove the pan from the oven and let it cool in the pan for about 15-20 minutes. Then, transfer it to a wire rack to cool completely before slicing into bars.
Fresh Takes Through the Year

These Oatmeal Cookie Smores Bars are versatile, allowing you to switch things up throughout the year.
- Add chopped nuts for a crunchy texture.
- Incorporate dried fruits like cranberries or cherries for a fruity twist.
- Try using flavored chocolate chips, such as peanut butter or white chocolate, for a unique taste.
- Top with a drizzle of chocolate or caramel sauce for an extra indulgence.
Flavor Logic
The harmony of flavors in Oatmeal Cookie Smores Bars comes from the combination of sweet, creamy, and chewy textures. The oatmeal provides a hearty base, while the marshmallow creme introduces a light, airy sweetness. Chocolate chips add a rich, decadent element that ties the whole dessert together. The slight saltiness from the butter and salt balances the sweetness, making each bite satisfying.
Prep Ahead & Store
If you want to get a head start on your baking, you can prepare the dough a day in advance. Simply store it in the refrigerator until you’re ready to bake. Once baked, Oatmeal Cookie Smores Bars can be stored in an airtight container at room temperature for up to a week. For longer storage, consider freezing them. Wrap individual bars in plastic wrap and place them in a freezer-safe container for up to three months. Just thaw them at room temperature, and they’ll be as delicious as the day they were made.
Quick Q&A
Can I use old-fashioned oats instead of quick cooking oats?
Yes, you can use old-fashioned oats, but the texture will be slightly different. The bars may be chewier and take a bit longer to bake.
How do I know when the bars are done baking?
The edges should be golden brown, and the center should look set. A toothpick inserted in the middle should come out with a few moist crumbs.
Can I use a different type of chocolate?
Absolutely! Feel free to use dark chocolate, white chocolate, or even flavored chocolate chips to suit your taste preferences.
What can I serve with these bars?
These bars pair well with a glass of cold milk, a scoop of vanilla ice cream, or even a drizzle of chocolate sauce for extra indulgence!
Similar Recipes
If you love Oatmeal Cookie Smores Bars, you might also enjoy:
- Oatmeal Chocolate Chip Cookies
- S’mores Brownies
- Classic Oatmeal Raisin Cookies
- Chocolate Chip Cookie Bars
In Closing
Oatmeal Cookie Smores Bars are not just a treat; they’re a celebration of flavors and textures that satisfy any sweet tooth. With their chewy oat base, creamy marshmallow layer, and rich chocolate, these bars are sure to become a beloved addition to your recipe collection. Whether you’re baking them for a gathering or just for yourself, you’ll find that each bite is a little piece of heaven. So gather your ingredients, preheat that oven, and let the deliciousness unfold!

Oatmeal Cookie Smores Bars
Ingredients
- 1 cup unsalted butter softened
- 1 cup brown sugar packed
- 1 large egg
- 1 teaspoon vanilla extract
- 1 teaspoon baking soda
- 1/2 teaspoon salt
- 1 1/2 cups all-purpose flour
- 1 1/2 cups quick cooking oats
- 17 ounce jar marshmallow creme
- 1 cup chocolate chips (milk or semi-sweet)
Instructions
- Preheat your oven to 350°F (175°C).
- Grease a 9x13 inch baking pan with butter or line it with parchment paper.
- Cream together the butter and brown sugar until light and fluffy, about 2-3 minutes.
- Beat in the egg and vanilla extract until well combined.
- In a separate bowl, whisk together the baking soda, salt, flour, and oats.
- Gradually add the dry ingredients to the wet mixture, stirring until just combined.
- Spread half of the oatmeal cookie dough evenly in the prepared baking pan.
- Spread the marshmallow creme over the first layer of dough, then sprinkle chocolate chips on top.
- Dollop the remaining oatmeal cookie dough on top of the marshmallow and chocolate layers.
- Bake for 25-30 minutes, or until the edges are golden brown and the center looks set.
- Cool in the pan for 15-20 minutes, then transfer to a wire rack to cool completely before slicing.
Equipment
- Mixing Bowl
- 9x13-inch Baking Pan
- Spatula
- Measuring cups and spoons
- Oven mitts
Notes
- Prepare the dough a day in advance and store in the refrigerator.
- Store baked bars in an airtight container at room temperature for up to a week.
- Wrap individual bars in plastic wrap and freeze for up to three months.
