Ultimate Cheesecake
["2 (8 oz.) pkg. cream cheese", "8 oz. whole milk Ricotta cheese", "16 oz. sour cream", "4 egg yolks", "1 c. sugar", "1 tsp. vanilla", "4 beaten egg whites", "graham cracker crust"]
["Cream the cheeses together. Add other ingredients and mix well. Fold in beaten egg whites.", "Pour into a 10-inch spring-form pan over graham crust.", "Bake in preheated 325\u00b0 oven for 60 minutes. Turn oven off and allow to rest in oven 10 minutes before opening oven door. Cool cake in oven. Serve after 1 to 2 days for ripening of flavor."]
["cream cheese", "Ricotta cheese", "sour cream", "egg yolks", "sugar", "vanilla", "egg whites", "graham cracker crust"]