Lemon Meringue Cupcake Recipe Lemon Meringue Cupcakes: fluffy lemon cupcakes filled with lemon curd and topped with a perfectly golden meringue frosting! Are you drooling yet? CUPCAKES – King Arthur Unbleached Cake Flour Blend, baking powder, salt, baking soda, sugar, butter, egg, vanilla extract, Buttery Sweet Dough Flavor (optional, but adds that signature bakery taste) and buttermilk. LEMON CURD – Easy Microwave Lemon Curd. MERINGUE – egg …