Crust:
2 cups crushed graham crackers
2 tablespoons sugar
8 tablespoons butter, melted

Filling:
3 packages cream cheese, at room temperature
1 1/2 cups sugar
4 eggs, at room temperature
1 carton ricotta cheese
1 pint sour cream
1 can pumpkin puree
1 tablespoon good vanilla

Preheat oven to 350 degrees Fahrenheit.

Combine the crust ingredients in a bowl, and mix thoroughly. Press into the bottom and halfway up the sides of a 10-inch springform pan. Cover the bottom and sides of the springform pan with aluminum foil. Set aside.

In a large mixing bowl, combine the softened cream cheese with the sugar. Mix on high until well combined and fluffy in appearance. Add the eggs one at a time, mixing well between each addition. Add the ricotta cheese, sour cream, pumpkin puree and the vanilla. Turn the mixer on low speed at first, gradually increasing the speed to high as you incorporate all the ingredients together. Mix until everything is well combined and the mixture is smooth.

Pour the filling into the prepared springform pan. Place the springform pan inside a larger pan (I use a roasting pan). Add hot water to the larger pan until the water level is about halfway up the sides of the springform pan.

Bake cheesecake at 350 degrees Fahrenheit for 1 hour. After an hour, turn off the heat, but let the cheesecake sit in the oven for an additional hour.

Remove from the oven, and cool before refrigerating. For best results, let the cheesecake cool in the refrigerator at least 8 hours or overnight before serving.