Step 1

Preheat oven to 350 degrees. Line a cookie sheet with parchment paper.

Step 2

Add the butter and sugar to a mixing bowl and cream together until light and fluffy, about 3 minutes. Add eggs and vanilla and mix well.

Step 3

In a separate bowl, combine the flour, cocoa powder, baking soda, and salt. Add to the bowl with the creamed butter mixture and stir just until combined.

Step 4

Scoop the dough by rounded tablespoons onto your cookie sheet. Bake for 8 minutes. Remove from oven and top with a marshmallow half (cut-size down). Return to oven for 2 minutes.

Step 5

Allow to cool completely while you make the frosting.

Step 6

Add butter to a mixing bowl and beat with electric mixers for 1 minute. Add the cocoa powder and milk and mix to combine. Add powdered sugar and mix for at least 2-3 minutes or until smooth. Mix in vanilla. Add more powdered sugar if needed.

Step 7

Once cookies have cooled, cover the tops of the marshmallow and cookie with frosting.

Step 8

Store leftovers in an airtight container, or freeze for later.