Name: Whoopie Pies
Prep time: 5 min
Cook time: 12 min
Total time: 17 min
Yield: 12 Servings
Ingredients: 8 tablespoons unsalted butter (, room temperature); 1 cup brown sugar (, packed); 1 large egg; 2 cups flour; 1/2 cup dutch cocoa powder; 1 1/4 teaspoons baking soda; 1 teaspoon salt; 1 cup buttermilk; 2 teaspoon vanilla; 8 tablespoons unsalted butter (, room temperature); 1 cup powdered sugar; 2 cups marshmallow fluff