Surprise Cookies

Martha Stewart features a "Cookie of the Day". I love trying new cookie recipes and this one looks really yummy!Makes about 2 dozen Ingredients: 1 3/4 cups all-purpose flour 3/4 cup cocoa powder 1/2 teaspoon baking soda 1/2 teaspoon salt 1/2 cup (1 stick) unsalted butter, softened 1 cup sugar 1 large egg 1/2 cup milk 1 teaspoon pure vanilla extract 12 large marshmallows, cut in half horizontally Chocolate Frosting for Surprise Cookies Directions: Preheat oven to 375 degrees. In a medium bowl, whisk together flour, cocoa powder, baking soda, and salt; set aside. In the bowl of an electric mixer fitted with the paddle attachment, cream together butter and sugar until light and fluffy, about 2 minutes. Add egg, milk, and vanilla, and beat until well combined. Add reserved flour mixture; mix on low speed until combined. Using a tablespoon or 1 3/4-inch ice cream scoop, drop dough onto ungreased baking sheets, about 2 inches apart. Bake until cookies begin to spread and become firm, 10 to 12 minutes. Remove baking sheets from oven, and place a marshmallow, cut-side down, in the center of each cookie, pressing down slightly. Return to oven, and continue baking until marshmallows begins to melt, 2 to 2 1/2 minutes. Transfer cookies to a wire rack to cool completely before frosting. Spread about 1 tablespoon of frosting over each marshmallow, starting in the center and continuing outward until marshmallow is covered.