Surprise Cookies {Countdown to Christmas}

Instructions

1. Preheat the oven to 375F. Line baking sheets with parchment paper.
2. Mix together the flour, cocoa powder, baking soda and salt in a bowl. Set aside. In the bowl of a mixer, beat the butter and sugar until light and fluffy, about 2 minutes. Add in the egg, milk and vanilla and beat to combine. Gradually add in the flour mixture and beat until it is completely combined.
3. Use a 1 3/4-inch scoop to make balls of dough and place on the prepared baking sheets, at least 2 inches apart. Bake, rotating the sheets halfway through, until the cookies are set, 8-10 minutes. Remove from the oven and immediately press a marshmallow half on the top of the cookie, return to the oven, and bake until the marshmallows begin to melt, about 2 minutes. Remove from the oven and allow to cool completely.
4. To make the frosting, put the confectioners’ sugar in a medium bowl. Melt the butter in a small pan over medium heat, then stir in the cocoa powder. Pour the mixture into the bowl with the confectioners’ sugar. Whisk in the milk and the vanilla. Spread 1 tablespoon of the frosting over the top of each cookie, covering the marshmallow.