Instructions

Beat egg yolks til thick in lemon color. Beat in sugar.
Break up cream cheese, adding small pieces at a time, beating continually.
Add sour cream, flour and vanilla and continue beating
til blended.
In another bowl, beat egg whites til stiff but not dry.(Soft peaks)
Gently fold into cheese mixture.
Grease a spring pan 8-9 inches round (no flour). Pour cheese mixture in a
nd place cake in oven. Then turn on to 350 degrees for 1 hour. Turn oven
off. Leave cake in oven for another hour with door 1/2 way open.
Cool completely, cover with waxed paper and refrigerate overnight to set.
Use a knife to break sides of cake pan.