Blend crumbs with butter and sugar. Press into bottom of 8 inch Pyrex cake dish. Bake at 300 degrees for 5 minutes and cool.
Blend cheese with sugar, cinnamon, vanilla, lemon peel and juice. Add egg yolks, 1 at a time. Mix well. Beat egg whites well and fold into mixture lightly. Pour on top of crust and bake at 325 degrees until you see a crack or two on top of filling. Cool slightly and on top of cake, spread the sour cream topping. Return cake to oven for 10 minutes. Cool and refrigerate.
