You’ll Need:3 cups all-purpose flour 1 cup granulated sugar 1 teaspoon baking soda 1 teaspoon baking powder 1 teaspoon salt 1 cup butter or margarine 1 cup buttermilk 2 eggs, slightly beaten 1 teaspoon vanilla extract 1 recipe Rhubarb Filling 3/4 cup granulated sugar 1/2 cup flour 1/4 cup butter