1/2 cup butter, softened
1 cup white sugar
1/4 cup milk
1 teaspoon vanilla
1 3/4 cups flour
1/3 cup unsweetened cocoa powder
1/2 teaspoon baking soda
18 large marshmallows, halved
Chocolate Buttercream Icing
Preheat oven to 350. Grease cookie sheet with Pam.
In a large bowl, cream together 1/2 cup butter and 1 cup sugar until smooth. Beat in the egg, then stir in the 1/4 cup milk and vanilla. Combine the flour, 1/3 cup cocoa and baking soda; stir into the creamed mixture. Drop by heaping teaspoonfuls onto greased cookie sheet.
Bake for 8 minutes. Remove cookie sheet and press marshmallow halves VERY LIGHTLY into the center of each cookie, cut side down. Return the cookies to the oven for an additional 2 minutes. Remove from the oven and press VERY LIGHTLY on the cookies to flatten slightly. Remove cookies to wire racks to cool.
When cool, frost with Chocolate Buttercream Icing.