Buckeye Cupcakes

Ingredients

• 2/3 cup confectioners’ sugar
• 1/2 cup creamy peanut butter
• 2 tablespoons unsalted butter, softened
• 1/4 teaspoons vanilla extract
• 16 tablespoons (2 sticks) unsalted butter, cut into 8 pieces
• 4 ounces bittersweet chocolate, chopped
• 1 cup Dutch-processed cocoa powder
• 1 1/2 cups all-purpose flour
• 1 teaspoon baking soda
• 1 1/2 teaspoon baking powder
• 4 eggs
• 1 1/2 cup granulated sugar
• 2 teaspoons vanilla extract
• 1 teaspoon table salt
• 1 cup sour cream
• 2 cups confectioners’ sugar
• 2 cups creamy peanut butter
• 10 tablespoons unsalted butter, at room temperature
• 1 1/2 teaspoons vanilla extract
• 1/2 teaspoon kosher salt
• 2/3 cup heavy cream