1 Preheat oven to 350 degrees F (175 degrees C). Grease and flour three 9 inch round layer cake pans.
2 In small bowl combine flour, baking powder and salt. In another small mixer bowl beat egg yolks until thick and lemon colored; set aside.
3 In large mixer bowl combine butter and sugar. Beat until very light and fluffy, scraping bowl occasionally. Beat in egg yolks. With mixer at low speed add dry ingredients alternately with milk and vanilla, starting and ending with dry ingredients. Divide evenly among prepared pans. Spread to edges.
4 Bake at 350 degrees F (175 degrees C) for 20 to 25 minutes, until golden. Let cool in pans for 10 minutes. Turn out onto wire racks to cool completely.