Sift remaining 1 cup sugar cake flour baking powder baking soda and salt into another bowl Add oil bananas half of the sour milk and the vanilla Beat for 1 minute at medium speed
Add remaining sour milk and the egg yolks Beat 1 minute longer Fold in egg whites Gently fold in nuts
Gently spoon into 2 greased and floured 8-inch cake pans Bake in a preheated 350 oven for 35 minutes