Preparation Steps

• Preheat the oven to 350°F. Line a baking sheet with parchment paper or silicone baking mats.
• Add your softened butter and both sugars to a large mixing bowl. Use an electric hand mixer to cream the ingredients together on medium-high speed until smooth. Whisk in the egg and vanilla until the egg is fully incorporated with the creamed sugar.
• Reduce the speed of your hand mixer and gently whisk in the cocoa powder, baking powder, baking soda, and flour. Fold in the chopped graham crackers and Hershey bars.
• Using a medium cookie scoop (about 2 tablespoons of dough), scoop and drop balls of cookie dough onto a baking sheet. Flatten each ball with your hands and place a marshmallow in the center of each cookie. Mostly wrap the dough around the marshmallow, leaving just a little of the top of the marshmallow peeking through. This will ensure the marshmallow is visible once baked.
• Bake your cookies for 10 to 12 minutes, until the edges are set (the centers will still be gooey). Let cookies cool on the pan for a few minutes to set up, before transferring them to a wire cooling rack to cool completely.