Chocolate Peanut Butter Cupcakes

Ingredients (22)

• For the cupcakes:
• 1/4 cup + 2 tablespoons unsweetened Dutch-process cocoa powder + extra for dusting
• 1/4 cup + 2 tablespoons hot water
• 1 1/2 cups all-purpose flour
• 1/2 teaspoon baking soda
• 1/2 teaspoon baking powder
• 1/2 teaspoon salt
• 3/4 cup 1.5 sticks unsalted butter
• 1 cup + 2 tablespoons sugar
• 2 large eggs
• 2 teaspoons vanilla extract
• 1/2 cup sour cream
• For the frosting:
• 3/4 cup 1.5 sticks unsalted butter, at room temperature
• 1 3/4 cup confectioners' sugar
• 3/4 cup creamy peanut butter
• pinch of salt
• For the chocolate ganache:
• 6 ounces semisweet chocolate
• 2/3 cup heavy cream
• 1 tablespoon light corn syrup
• peanut butter cups