Gather the ingredients - * Butter * Sugar * Egg * Vanilla extract * Flour * Cocoa powder * Baking soda * Chopped chocolate * Mini marshmallows * Mini freeze-fried marshmallows
Add the softened butter and granulated sugar to the bowl of a stand mixer fitted with the paddle attachment and beat until light and fluffy.
Next, add the egg and vanilla. Mix to combine.
In a small bowl, whisk together the flour, cocoa powder, and baking soda.
With the mixer on low speed, slowly add the dry ingredients. Mix just until no large lumps of flour remain.
Add the chopped chocolate, mini marshmallows, and freeze-dried marshmallows. Fold the add-ins into the cookie dough, mixing just until they are evenly distributed.
Use a cookie scoop (or two spoons) to portion out 1 tablespoon sized balls and place them on the parchment lined baking sheets. Make sure to place them at least 2" apart.
Bake the cookies for 12-14 minutes, or until the edges are set. Allow the cookies to cool completely on the tray before removing them to an airtight container.
Store any leftover cookies in an airtight container at room temperature for up to three days.