Crust - crush grahm crackers and add 1/4 cup sugar and 1/3 cup melted butter. Mix and form crust in bottom of a spring form pan.
Filling - Using a mixer, soften cream cheese in large bowl. Add eggs one at a time. Add 1 cup sugar, vanilla, whipping cream and flour. mix until smooth.
Pour over crust into spring form pan. Bake 300 degrees for 1 hour. Knife test and adjust cooking time. For creamier crack free cake, wrap springform pan in foil so water can not get in and place in a larger baking pan. Surround with boiling water. Your cooking time will be longer.
Topping - mix sour cream, sugar and vanilla until smooth. Cool cake for 15 minutes then spread on topping. Return to oven for 5 minutes.
Let cool then refridgerate. Best when served at room tempature. Can top with fruit or just eat it as is.