Good-Cooking - Whoopie Cupcakes

Ingredients

• 1 1/2 cups all-purpose flour
• 1 cup granulated sugar
• 1 teaspoon baking soda
• 1 teaspoon salt
• 6 tablespoons cocoa powder
• 3 tablespoons Crisco
• 1 cup sour milk (1 teaspoon vinegar plus 1 cup milk)
• 1 teaspoon vanilla extract
• 2 1/2 tablespoons flour
• 1/2 cup milk
• 1/2 cup granulated sugar
• 1/4 cup Crisco
• 1/4 cup butter