Cream the ricotta and cream cheese, add the eggs, beating them in one at a time.Add the vanilla.Spoon in the flour and sour cream, mix well."It's going to be loose, don't worry", says Nanny.So don't worry.This works.Pour the mix into a 10" springform cake pan.Bake in a 325 deg oven for 1 hour, more or less, as in othe recipe...