Mini Whoopie Pies Recipe | Epicurious

Ingredients

• 1 1/4 cups unbleached all-purpose flour
• 3/4 cup whole-wheat flour
• 1/2 cup unsweetened cocoa, such as Droste
• 1/2 teaspoon baking soda
• 1/2 teaspoon fine salt
• 1 stick unsalted butter, at room temperature
• 1 cup granulated sugar
• 1 large egg
• 1 cup milk
• 1 stick unsalted butter, softened
• 1 2/3 cups confectioners' sugar
• 1/2 teaspoon vanilla extract
• 2 cups marshmallow cream