Easy Whoopie Pies 2 cups unsifted flour 1/3 cup unsweetened cocoa powder 1 teaspoon baking soda 1/4 teaspoon salt 3/4 cup milk 1 teaspoon vanilla extract 1 egg 1/3 cup vegetable oil 1 cup granulated sugar Preheat oven to 350 degrees F. Combine flour, cocoa, baking soda and salt in bowl; set aside. Combine milk and vanilla extract in measuring cup; set aside. Beat egg and oil in bowl of electric mixer until combined. Add sugar to egg-oil mixture; beat until pale yellow, about 3 minutes. Add flour and milk mixtures alternately to egg mixture, beginning and ending with flour mixture. Drop about 1 tablespoon of the batter onto greased cookie sheets, 2 inches apart. Bake until top springs back lightly when touched, 5 to 7 minutes. Remove to wire racks to cool. Filling 2 cups Marshmallow Creme 1 cup confectioners' sugar 1/2 cup (1 stick) unsalted butter, softened 1 teaspoon vanilla extract Combine Marshmallow Creme, confectioners' sugar, butter and vanilla in bowl of electric mixer. Beat on medium speed until fluffy, about 2 minutes. Spread filling between 2 cake halves to make sandwich. Yields 15 pies.