Crust:

2 c. graham cracker crumbs
1/2 c. (1 stick) butter, melted
1/3 c. granulated sugar

Combine crumbs, butter and sugar in medium bowl; press onto bottom of ungreased 13 x 9 inch baking pan.

Filling:

2 pkg. (8 oz. each) cream cheese, softened
1 c. granulated sugar
1/4 c. all purpose flour
1 1/2 c. undiluted evaporated milk
2 eggs
1 tbsp. vanilla extract
1 c. (6 oz.) semi-sweet chocolate chips

Beat cream cheese, sugar and flour in large mixer bowl until smooth. Gradually beat in evaporated milk, eggs and vanilla. Microwave chocolate chips in medium, microwave safe bowl on HIGH (100% power) for 1 minutes; stir. Microwave at additional 10 to 20 second intervals, stirring until smooth. Stir 1 c. cream cheese mixture into chocolate. Pour remaining cheese mixture over crust. Pour chocolate mixture over cheese mixture; swirl with spoon to create marble effect.

Bake in preheated 325°F oven for 40 to 45 minutes or until set. Cool to room temperature; chill until firm. Cut into triangles.

Makes about 2 1/2 doz. triangles.