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Whoopie Pies

1hr 0min · 8 servings

A dark, deep cake-like exterior sandwiched together with a billowy, marshmallow interior.

Ingredients

• 1 large egg

• 5 1/4 ounces sugar

• 5 1/4 fluid ounces buttermilk

• 1/2 teaspoon vanilla extract

• 2 3/4 ounces unsalted butter, melted

• 3/4 teaspoon baking soda

• 1/4 teaspoon baking powder

• 1 teaspoon instant espresso powder

• 1/2 teaspoon salt

• 2 3/4 ounces unsweetened cocoa powder (or dutch processed cocoa)

• 7 ounces all-purpose flour

• 4 ounces unsalted butter, softened at room temperature

• 4 1/2 ounces confectioner's sugar

• 1/2 tablespoon vanilla extract

• 3 ounces marshmallow fluff

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