Makes one cake INGREDIENTS 3 cups cake flour 1 tablespoon baking powder ½ teaspoon salt ½ pound (2 sticks) unsalted butter 2 cups sugar 5 eggs 1½ teaspoons vanilla 1¼ cups buttermilk Lemon curd, for filling Basic Buttercream, for frosting DIRECTIONS Preheat oven to 350°F. Prepare 2 sheet pans with non-stick spray and parchment paper.…