Preheat oven to 350 degrees. Grease & Flour the bottom & sides of 3 round 9 x 1 1/2inch pans.

In seperate medium bowl mix together the flour, baking powder, baking soda & salt. Then set aside. In a large seperate mixing bowl with an eletric mixer cream the softened unsalted butter & sugar together on high until light & fluffy. Scrape down the sides often. Reduce speed to low. Alternately add the flour mixture, milk, vanilla & egg yolks. Mix well between each addition. Scrape down sides often. Pour batter into prepared pans.

Bake for 25 to 30 minutes or until toothpick inserted in the center comes out clean. Cool in the pans for 10 minutes. Then remove from the pans & place on wire cooling rack. Completely cool cakes.

You may slice each cake horizontally in half & fill with your favorite choice of filling. Replace top layer. Repeat with each layer & stack onto of each other. then you can frost & decorate as you wish.