Preheat oven to 350°F. grease 9 in baking dish

in a bowl, mix graham crackers and melted butter and press in bottom of dish to create crust

mix remaining ingredients until smooth and spoon onto pressed crust mix

Turn the oven off, and let cake cool in oven with the door closed for 5 to 6 hours; this prevents cracking. Chill in refrigerator until serving