01 -
Preheat oven to 375°F (190°C). Line baking sheets with parchment paper.
02 -
In a large bowl, cream together the softened butter, granulated sugar, and brown sugar until the mixture is light and fluffy.
03 -
Beat in the eggs one at a time until fully blended, then mix in the vanilla extract.
04 -
In a separate bowl, whisk together the all-purpose flour, unsweetened cocoa powder, baking soda, and salt until fully combined.
05 -
Gradually add the dry mixture to the wet ingredients, stirring just until incorporated. Avoid overmixing to maintain a tender texture.
06 -
Gently fold in the semi-sweet chocolate chips and 1 1/2 cups of mini marshmallows, reserving 1/2 cup of marshmallows for topping.
07 -
Drop rounded tablespoons of dough onto the prepared baking sheets, spacing evenly.
08 -
Press a few reserved mini marshmallows onto the top of each cookie dough mound.
09 -
Bake in preheated oven for 10-12 minutes, until edges are set but centers remain slightly soft.
10 -
Allow cookies to cool on the baking sheets for several minutes, then transfer to a wire rack to cool completely.