Surprise Cookies

These cookies were a big hit at home and at the baby shower I took them to. I found them on Martha Stewart's website.

Ingredients
1 3/4 cups flour
3/4 cup cocoa powder
1/2 t baking soda
1/2 t salt
1/2 unsalted butter softened
1 c sugar
1 large egg
1/2 c milk
1 t vanilla
12 large marshmallows, cut in half horizontally

Frosting
2 c powered sugar
4 T melted butter
1/4 c cocoa
1/4 c milk
1/4 t vanilla

1. Preheat oven to 375. In medium bowl, whisk together flour, cocoa, baking soda, and salt;set aside.
2. Cream butter and sugar until light and fluffy. Add egg, milk, and vanilla until well combined. Add flour mixture.
3. Using a tablespoon or small ice cream scoop drop balls onto ungreased cookie sheet about 2 inches apart. Bake 10-12 minutes.
4. Remove sheets from oven and put a marshmallow cut side down on each cookie and press down. Return to oven and bake until the marshmallow begins to melt (around 2 minutes). Cool completely.
5. Spread about 1 T of frosting over each marshmallow, starting in the middle and continue outward until the marshmallow is covered.