Nutella Cupcakes

Name: Nutella Cupcakes
Prep time: 30 min
Cook time: 17 min
Total time: 47 min
Cuisine: American
Ingredients: 1/3 cup flour; 4 teaspoons cocoa powder; 1/4 teaspoon baking soda; 1/4 teaspoon baking powder; 1/4 teaspoon instant espresso powder; 4 teaspoons oil; 1/4 teaspoon vanilla; 1/4 cup packed dark brown sugar; 1/3 cup buttermilk (at room temperature); 2 tablespoons Nutella; 1 tablespoon sour cream; 1/4 cup cold heavy whipping cream; 1/8 teaspoon instant espresso powder; 1 tablespoon cocoa powder; 1-2 tablespoons powdered sugar