3 bake
to make crust, combine 1 and press into a 10 inch springform pan
to make filling , combine cream cheese, ricotta cheese, sour cream , eggs, sweetened condensed milk,sugar, margaring, beat on medium speed, mixing togeter well, and add cornstarch and flour, mixing well.
to bake,pour filling into springform pan and bake 1 hourand turn off over and let it set in over 1 hour do not open oven door.