RECIPE: Maine's Best Whoopie Pies

Ingredients

• 2 cups All-Purpose Flour ((283 Grams))
• ½ cup Dutch-Processed Cocoa Powder ((43 Grams))
• 1 teaspoon Baking Soda
• ½ teaspoon Table Salt
• 1 cup Packed Light Brown Sugar ((198 grams))
• 8 tablespoons Unsalted Butter ((1 Stick) Softened, But Cool)
• 1 Large Egg (Room Temperature)
• 1 teaspoon Vanilla Extract
• 1 cup Buttermilk
• 12 tablespoons Unsalted Butter ((1½ Sticks) Softened, But Cool)
• 1 ¼ cups Confectioners' Sugar ((142 grams))
• 1 ½ teaspoons Vanilla Extract
• ⅛ teaspoon Table Salt
• 2 ½ cups Marshmallow Fluff