Boston Cream Cupcakes Ingredients Cupcakes 2 1/2 cups all-purpose flour 3/4 tsp. baking soda 1/2 tsp. each baking powder and salt 3/4 cup (1 1/2 sticks) unsalted butter, softened 1 1/4 cups sugar 3 large eggs 2 tsp. vanilla extract 1 cup buttermilk Filling 1 package (3 oz) cook & serve vanilla pudding 1