2 lg. Philadelphia cream cheese
1 lg. sour cream
1 stick butter
6 eggs
3 tbsp. sifted flour
1 c. confectioners' sugar
2 tsp. vanilla
1 tbsp. lemon juice
3/4-1 bag graham cracker crumbs
10 inch spring pan
Optional: cherry or blueberry pie filling

Preheat oven to 375 degrees.

Crust: Cut graham cracker crumbs with butter until you get pea-like consistency. Press crust into greased and floured spring pan.

Filling: Beat separated egg whites until stiff and refrigerate. In a large bowl, mix cheese with sour cream until smooth. Add sugar, vanilla and lemon juice. Add egg yolks, one by one. Add flour. Mix well. Add stiff egg whites to mixture last and mix gently. Bake at 375 degrees for 20 minutes, at 300 degrees for 20 minutes, and at 275 degrees for 20 minutes. Let cool in oven. Top with pie filling if desired.