1-Preparation of Ingredients: First, prepare your ingredients by roughly chopping the graham crackers and chocolate bar into small, even pieces. This helps distribute them evenly throughout the cookie dough. For the mini marshmallows, tear them in half rather than leaving them whole. This technique prevents them from puffing up excessively during baking and creates a better texture in the finished cookies.

2-Making the Dough: Begin by combining the dry ingredients in a medium bowl. Whisk together the flour, salt, baking powder, baking soda, and cornstarch until well blended. This ensures even distribution of the leavening agents throughout the flour, which is essential for uniform rising during baking. In a separate larger bowl, use a stand mixer or hand mixer to cream the softened butter and both sugars together. Beat them on medium speed until the mixture becomes light and fluffy, which usually takes about 2-3 minutes. This step incorporates air into the dough, resulting in a lighter cookie texture. Add the egg and vanilla extract to the creamed butter mixture, mixing until thoroughly combined. Remember to scrape down the sides of the bowl occasionally to ensure everything is evenly incorporated. This step guarantees that your cookies will have a consistent flavor throughout.

3-Combining Wet and Dry Ingredients: Gradually add the dry mixture to the wet mixture, mixing on low speed. Continue mixing until the ingredients are just combined be careful not to overmix at this stage, as overmixing can lead to tough cookies. Now it’s time to add the special ingredients that make these cookies reminiscent of classic s’mores. Reserved a handful of the torn marshmallows for later use, then add the remaining marshmallows, chocolate chips, and chopped graham crackers to the dough. Mix gently on low speed just until these additions are distributed throughout the dough.

4-Chilling and Baking: Refrigerate the dough for at least one hour. This chilling period is crucial as it prevents the cookies from spreading too much during baking and helps develop the flavors. If you’re short on time, you can refrigerate for as little as 30 minutes, but the full hour yields better results. When ready to bake, preheat your oven to 350°F and line a baking sheet with parchment paper. Portion the chilled dough into two-tablespoon sized balls and place them about two inches apart on the prepared baking sheet. This spacing allows room for the cookies to spread slightly during baking. Bake the cookies for 8 minutes, then remove them from the oven. This is when you’ll add the final touches for that perfect s’mores appearance. Top each cookie with some of the reserved marshmallows and pieces of the chocolate bar. Return the cookies to the oven and bake for another 2-3 minutes until they are fully cooked but still soft. If you notice the marshmallows overflowing during this final baking stage, don’t worry it’s a common occurrence. Simply use a round cookie cutter or a spatula to gently push the edges back in. This technique helps maintain a neat appearance while preserving that delicious marshmallow topping. Allow the cookies to cool on the baking sheet before removing them. They are quite soft when hot and need time to firm up. According to cookie baking experts, proper cooling is essential for achieving the ideal texture in your homemade cookies.