Occasionally I take a treat to the office and people go completely wild. Such was the case with these s’mores bars, which I’ve made twice already this summer and people still ask me to make again. Fear not, coworkers. There will always be more s’mores bars, regardless of the time of year.

These treats are essentially a chocolate chip cookie dough made with crushed graham crackers. A layer of marshmallows, which melts and leaves a delicious flavor and wonderful chewy texture, goes in between two layers of cookie dough. One caveat: the dough is quite thick and rather difficult to spread, but I developed an effective (if not slightly odd) technique for creating the layers.

Ingredients

• 2 1/2 cups flour
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 1 1/2 cups graham cracker crumbs (from about 12 full sheets of crackers, see tips below)
• 1 cup butter, at room temperature
• 1 cup light brown sugar, packed
• 1/2 cup granulated sugar
• 2 eggs
• 2 teaspoons vanilla extract
• 1 cup milk chocolate chips
• 2 1/4 cups miniature marshmallows

Preparation

Preheat oven to 350 degrees. Line a 9 x 13 baking tin with parchment paper.

In a medium bowl, combine flour, baking soda, and salt; set aside.

To make graham cracker crumbs, break full sheets apart and place in a zip-top bag. Use a mallet, rolling pin, or the back of a spoon to finely crush into crumbs. It takes about 10-12 full sheets of crackers to make 1 1/2 cups; start with 10 and add more if you need to.

In a mixer fitted with the paddle attachment, cream the butter, brown sugar, and granulated sugar until light and fluffy, about 3 minutes. Add the eggs and vanilla extract and beat to combine. Gradually add the flour mixture, beating on low to just combine. Stir in graham cracker crumbs, then chocolate chips.

Divide the dough in half; it will be difficult to spread in the pan because it’s so thick, and there’s not a ton of dough.  I took handfuls of dough and flattened them between my palms to create large cookie-sized portions, then placed them in the tin to cover the bottom and spread the dough gently with my fingers to connect the pieces together. Top with miniature marshmallows and repeat the process to cover the marshmallows as completely as you can. It’s okay if a few marshmallows poke through.

Bake for 25-30 minutes, until the edges are golden brown and the center is still set up still soft. Remove from oven and cool in the pan about 15 minutes, then lift out using the parchment paper and cool completely on a wire rack before cutting into squares. Makes 24.