Use spring form pan. Mix graham crackers (crushed), butter and sugar for crust mixture and bake for 8 minutes at 180ºC ; cool for 15 minutes. Combine filling ingredients and mix together with electric mixer until fluffy. Pour into crust (cooled) and bake for 30 minutes at 180ºC . Cool for 30 minutes. Combine all topping ingredients and beat until fluffy. Pour over cheesecake (cooled) and bake an additiona 10 minutes at 180ºC . Refrigerate several hours or overnight.