calories in buttercream icing
Coming in at 497 calories, their biggest diet-ditcher was their red velvet cupcake. Photo courtesy of LA Times. BEST Cupcake from Magnolia Bakery. NYC's first big cupcake hot spot, Magnolia Bakery's vanilla cupcake with buttercream frosting and sprinkles has a calorie count of 202 making it the second best on our list.