1/3 c. butter, melted
1 1/2 c. graham cracker crumbs
1/4 c. flour
2 tbsp. sugar
1 (14 oz.) can sweetened condensed milk
1 (8 oz.) cream cheese, softened
1 c. sour cream (8 oz.)
2 eggs
1 tsp. vanilla

Preheat oven to 350 degrees. Combine butter, graham cracker crumbs, flour, and sugar. Reserve 1/2 cup mixture and press remaining crumbs in an 8 inch square baking dish. Bake 7 minutes and cool.

In large bowl, beat cream cheese until light and fluffy. Add sweetened condensed milk, sour cream, eggs, and vanilla. Beat until smooth. Pour over baked crumbs. Sprinkle with reserved crumbs. Bake 30 minutes. Chill and cut into squares. Refrigerate leftovers.