Cookie ingredients:
Flour
Butter
Sugar
Cocoa powder
Milk
Egg
Vanilla
Baking soda & salt
Topping ingredients:
Marshmallows
Powdered sugar
Cocoa powder
Butter
Milk
Salt
Cream the butter and sugar together, then add the egg and vanilla.
Stir in the flour, cocoa powder, baking soda, and salt to form a dough.
Roll the dough into 1-inch balls, and bake at 350°F for 8 minutes.
Top each cookie with half a large marshmallow, and bake for 3 more minutes.
While the cookies cool, beat together the butter, cocoa powder, powdered sugar, salt, and milk.
The frosting will be runnier than usual—that's a good thing!
Top each cookie with a dollop of frosting, letting the marshmallow peek through a little.
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