Each tier is made up of 3 layers of cake. To make first set of 6-, 8- and 10-inch layers, in large bowl mix 2 cups of the flour, 1 3/4 cups granulated sugar, 1/2 cup butter, 1 teaspoon of the baking powder, 3/4 teaspoon of the baking soda, 1 teaspoon salt, 1 cup of the buttermilk, 2 teaspoons of the vanilla and 3 of the eggs. Beat with electric mixer on low speed 30 seconds. Beat on high speed 3 minutes. Spread about 3/4 cup batter in 6-inch pan, about 1 3/4 cups batter in 8-inch pan and about 2 1/2 cups batter in 10-inch pan.