Step-by-Step Instructions

• Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
• Combine the softened butter, granulated sugar, and brown sugar in a large mixing bowl and cream together until light and fluffy.
• Add the eggs one at a time, mixing well after each addition, then stir in the vanilla extract.
• In a separate bowl, sift together the flour, cocoa powder, baking soda, and salt.
• Gradually add the dry ingredients to the wet ingredients, mixing on low speed until just combined.
• Fold in the chocolate chips and mini marshmallows until evenly dispersed.
• Drop rounded balls of dough onto the prepared baking sheet, spacing them about 2 inches apart.
• If using, sprinkle the crushed graham crackers on top of the dough balls before baking.
• Bake for 10-12 minutes until the edges are set but the centers are slightly underbaked.
• Allow the cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack.