Cream butter and sugar; add egg yolks, mixing well. Add 1 cup flour and baking powder alternately with buttermilk and soda. Add mashed bananas and vanilla; mix well. Fold in stiffly beaten egg whites. Roll nuts in 1 cup of flour and add to the mixture. Bake at 350 degrees for 25 minutes in two well greased cake pans. Cool and ice. To make Butter Icing: Cream butter and sugar; add milk slowly and beat. Add vanilla and nuts. From . Downloaded from G Internet, G Internet.