Clara Zilch's Cheese Cake

This recipe was submitted by Cathy Warner.  This is her mom's recipe. 

Crust:
1 1/4 cups graham cracker crumbs
4 tablespoons butter, room temperature
1/4 cup white sugar

In a medium-size bowl, mix the above ingredients together with a fork until crumbly.  Pat in a lightly buttered (bottom only) 9x13-inch baking pan.  Put in freezer while preparing filling.

Filling:
1 pound original brand cream cheese, room temperature
1/2 cup white sugar
3 eggs, added one at a time
1 teaspoon vanilla.

In a medium-size mixing bowl, use an electric mixer to cream together the cream cheese and white sugar.  Beat in the eggs, one at a time, and then the vanilla.  Pour over graham cracker crust and spread evenly.  Bake at 375 degrees for 20 minutes.  Remove cake from oven and cool for 20 minutes.  Prepare the topping.

Topping:
1 pint sour cream
1/2 cup white sugar
1 teaspoon vanilla

Place topping ingredients in a small bowl and beat until smooth with an electric mixer.  Pour over cheese cake and bake for an additional 10 minutes.  Cool and refrigerate.