Halloween Whoopie Pies

Ingredients (19)

• Cakes:
• 2 cups all-purpose flour
• 1/2 cup cocoa powder
• 1 teaspoon baking soda
• 1/2 teaspoon baking powder
• 1/2 teaspoon salt
• 1/2 cup unsalted butter
• 1 cup brown sugar
• 1 large egg
• 1 teaspoon vanilla extract
• 1 cup buttermilk
• Black food coloring (opt.)
• Orange and red nonpareils or decorating sugar
• Filling:
• 1 cup unsalted butter, soft
• 2 cups powdered sugar
• 1 teaspoon vanilla extract
• 1 (7 oz.) jar Marshmallow fluff
• Orange food coloring (opt.)