Pre-heat oven to 350 degrees.
Grease and flour three 6" X 1 1/2" round cake pans.
Mix together flour, cocoa powder, baking powder and baking soda. Set aside.
In a large bowl, beat butter, eggs and vanilla.
Gradually add sugar.
Beat on medium to high speed for about 3-4 minutes until well mixed
Alternately combine in flour mixture and milk to batter while beating.
Continue to beat until batter is smooth.
Pour equal amounts of batter into greased and floured round cake pans.
Bake 30 to 35 minutes.
Check with a toothpick to se if it is done. Bake a few minutes more, if needed.
Remove from oven and allow cakes to cool in pans for a few minutes.
Place cakes on a wire rack, to them allow to completely cool.