Family-Favorite Cheesecake

2 1/2 cups graham crackers (about 40 squares)
1/3 cup sugar
1/2 teaspoon ground cinnamon
1/2 cup butter or margarine, melted

Filling:
3 packages ( 8 ounces each) cream cheese, softened
1 1/2 cups sugar
1 teaspoon vanilla exract
4 eggs, separated

Topping:
1/2 cup sour cream
2 tablespoons sugar
1/2 teaspoon vanilla extract
1/2 cup whipping cream, whipped

In a small bowl, combine the cracker crumbs, sugar and cinnamon; stir in butter. Press onto the bottom and 2 in. up the sides of a greased 9 in spring form pan. Bake at 350 degrees for 5 minutes. Cool on a wire rack. Reduce heat to 325 degrees. In a mixing bowl, beat cream cheese, sugar and vanilla until smooth. Add egg yolks; beat on low just until combined. In a small mixing bowl, beat egg whites until soft peaks form; fold into cream cheese mixture. Pour over crust. Bake for 1 hour or until center is almost set. Cool on a wire rack for 10 minutes. Carefully run a knife around edge of pan to loosen; cool 1 hour longer. Refrigerate until completely cooled. Combine he sour cream, sugar and vanilla; fold in whipped cream. Spread over he cheesecake. Refrigerate overnight. Remove sides of pan. Yield: 12 servings.

Top with blueberries or strawberries, if desired.