16 oz. cream cheese
16 oz. Ricotta cheese
16 oz. sour cream
3 tsp. cornstarch
1 1/2 c. sugar
4 eggs
1/4 lb. butter
3 tsp. flour
1 tbsp. vanilla

Cream cheese and sour cream well. Blend in one egg at a time. Add sugar, flour, and cornstarch. Last add melted butter and vanilla; blend until very smooth.

Pour into greased 10-inch springform pan. Bake 60-75 minutes at 325 degrees or until slightly brown on top. Shut oven; leave in 1 hour more.