Chocolate Whoopie Pies

Recipe Time!  Whoopie Pies by the book Whoopie Pies! Makes 24 Whoopies and two types of frosting!  What you’ll need:  1 ⅔ cup all purpose flour ⅔ cup unsweetened cocoa powder 1 ½ tsp baking soda ½ tsp salt 1 stick unsalted butter (room temp) 1 cup light brown sugar 1 egg 1 tsp vanilla 1 cup milk Marshmallow Frosting 6 tablespoons unsalted…