S’mores Cookie Bars

Why You’ll Love This Recipe

I love this recipe because it combines everything I want in a dessert: chewy cookie layers, melted chocolate, and gooey marshmallows in every bite. I also enjoy how it captures the flavor of classic campfire s’mores but in a soft, easy-to-slice bar form that I can make any time of the year.

I like how simple it is to prepare in one pan, and I appreciate that it works well for sharing at gatherings, parties, or casual family desserts. I also enjoy the contrast of textures between the crispy top, soft center, and melted chocolate pockets.

Ingredients

(Here’s a tip: Check out the full list of ingredients and measurements in the recipe card below.)

1 cup unsalted butter, softened
1 cup brown sugar, packed
1/2 cup granulated sugar
2 large eggs
1 teaspoon vanilla extract
2 1/2 cups all-purpose flour
1 teaspoon baking soda
1/2 teaspoon salt
1 cup graham cracker crumbs
1 cup chocolate chips
1 cup mini marshmallows
Extra chocolate chips and marshmallows for topping (to taste)

Directions

I start by preheating my oven to 350°F (175°C) and preparing a 9×13 inch baking pan with grease or parchment paper.

I cream together the softened butter, brown sugar, and granulated sugar until the mixture becomes light and fluffy.

I beat in the eggs one at a time, mixing well after each addition, then I stir in the vanilla extract.

In a separate bowl, I whisk together the flour, baking soda, and salt to distribute everything evenly.

I gradually add the dry ingredients into the wet mixture, mixing just until combined so I avoid overworking the dough.

I fold in the graham cracker crumbs and chocolate chips until they are evenly spread throughout the dough.

I press half of the dough into the prepared pan to form the base layer.

I sprinkle mini marshmallows over the base, then I add the remaining cookie dough on top and gently spread it to cover the marshmallows.

I finish by adding extra chocolate chips and marshmallows on top for a more indulgent finish.

I bake everything for 25–30 minutes, until the top turns golden and a toothpick inserted comes out mostly clean.

I let the bars cool in the pan for about 10 minutes, then I lift them out and allow them to cool completely before slicing into squares.

Servings and timing

I get about 12 servings from this recipe.

I spend around 15 minutes preparing the dough and assembling everything, and I bake it for 25–30 minutes. The total time comes to about 45 minutes, plus cooling time before slicing.

storage/reheating

I store these cookie bars in an airtight container at room temperature for up to 3 days. If I want them to last longer, I refrigerate them for up to a week.

When I reheat them, I warm a piece in the microwave for about 10–15 seconds to bring back the gooey chocolate and soft marshmallow texture. I also like to warm them slightly in the oven for a few minutes if I want a freshly baked feel.

FAQs

Can I use different types of chocolate in this recipe?

Yes, I like using milk chocolate, dark chocolate, or even chopped chocolate bars depending on how rich I want the flavor.

Do I need to toast the marshmallows first?

No, I do not toast them beforehand. They melt and toast naturally while baking in the oven.

Can I make these cookie bars ahead of time?

Yes, I often make them a day ahead because they hold their texture well after resting.

Why are my cookie bars too hard?

This usually happens when I overbake them or overmix the dough, so I keep a close eye on baking time.

Can I freeze S’mores Cookie Bars?

Yes, I freeze them in an airtight container and thaw them at room temperature before serving.

Conclusion

I love making these S’mores Cookie Bars because they bring together classic flavors in a simple, shareable dessert. I enjoy how easy they are to prepare and how satisfying they are with every bite, making them one of my go-to sweet treats for any occasion.