Mocha Whoopie Pies Recipe | King Arthur Baking

Ingredients

• 8 tablespoons (113g) unsalted butter, at room temperature, at least 65°F
• 1 cup (213g) light brown sugar or dark brown sugar, packed
• 3 tablespoons (21g) espresso powder
• 1 teaspoon baking powder
• 1/2 teaspoon baking soda
• 3/4 teaspoon table salt
• 1 large egg, at room temperature
• 1/2 cup (43g) unsweetened cocoa, Dutch-process or natural
• 2 1/3 cups (280g) King Arthur Unbleached All-Purpose Flour
• 1 cup (227g) milk, at room temperature
• 2 cups (340g) semisweet chocolate, chopped
• 1 cup (227g) heavy cream