FFor the cake: - 2 cups all-purpose flour - 1 1/2 cups sugar - 1/2 cup unsalted butter, softened - 1 cup buttermilk - 3 large eggs - 1 teaspoon vanilla extract - 1 teaspoon baking powder - 1 teaspoon baking soda - 1/2 teaspoon salt ingredients For the buttercream frosting: - 1 cup unsalted butter, softened - 4 cups powdered sugar - 1/4 cup heavy cream - 2 teaspoons vanilla extract - Pinch of salt