Cream butter, sugar, cream cheese. Add 1 egg yolk at a time, beating well after each. Add flour, alternately with sour cream. Take you egg whites and beat stiffly, adding salt to mixture. Fold into batter and add vanilla and pour into greased and floured tube pan. Hit pan on counter 5 times to take air out and Bake in preheated 325 to 350 oven (depends on your oven I do 325)for 1 hour or until toothpick inserted comes out clean! I took some confectioners sugar and milk and mixed and put on cake as a glaze!!!