1 (12 oz.) pkg. semi-sweet chocolate chips
1/2 c. butter
2 c. graham cracker crumbs
1 (8 oz.) pkg. cream cheese
1 (14 oz.) can sweetened condensed milk
1 egg
1 tsp. vanilla

Preheat oven to 325 degrees. In medium saucepan over very low heat, melt chocolate chips and butter, stirring until smooth. Stir in graham cracker crumbs. Remove 1/4 cup mixture for later use. Press remaining graham cracker mixture evenly in a 13 x 9 inch baking pan.

In large bowl with electric mixer, beat cream cheese until smooth. Gradually beat in condensed milk, then add and vanilla. Pour over prepared crust. Sprinkle with reserved crumb mixture. Bake until set, 25 to 30 minutes at 325 degrees. Cool. Refrigerate until cold, about 2 hours or longer. Cut into 24 squares.

Serves 24.