Chocolate Marshmallow Meltaways

We still have some marshmallows left from the package my mom sent us back in December, and I've been trying to figure out what to do with them. Allrecipes.com did not disappoint. A few minor adjustments to their original recipe and yum. Shannon claims they're better than chocolate chip cookies. Get a full glass of milk, whatever you think, because these are rich and sweet.

yield: 3 dozen

Cookies:
1/2 cup butter, softened
3/4 cup sugar
1 egg
1/4 cup milk
1 tsp vanilla
2 1/4 cups flour
1/2 cup cocoa
1/2 tsp baking soda
1/2 tsp salt
18 large marshmallows, halved

Frosting:
3 Tbsp butter, softened
3 Tbsp milk
3 Tbsp cocoa
1/8 tsp salt
3/4 tsp peppermint extract (option, if you want Chocolate Mint Marshmallow Meltaways)
3 cups powdered sugar

1. Preheat oven to 350°.
2. To prepare cookies, cream together butter and sugar in a mixer on medium speed; add egg, milk, and vanilla, and beat until well combined. In a small bowl, combine flour, cocoa, baking soda, and salt, stirring well with a whisk. Add flour mixture to butter mixture, stirring until combined and soft dough forms.
3. Using your hands, roll dough by the tablespoonful gently into balls and place on an ungreased cookie sheet. Flatten dough slightly with your hand. Bake at 350° for 8 minutes. Remove from oven, press one marshmallow half onto the top of each cookie, and return to oven. Bake 2 minutes; remove from oven and cool cookies on a wire rack.
4. To prepare frosting, using a mixer on medium-high speed, combine butter, milk, cocoa, and salt (and peppermint extract, if you choose) in a large bowl. Gradually add powdered sugar, mixing until well combined. Frost cooled cookies. Enjoy with a large glass of milk.