Brownie Cheesecake

1 Pkg brownie mix
4 pkg (8 oz each) Philadelphia Cream Cheese
1 cup sugar
1 tsp vanilla
1/2 cup sour cream
3 eggs
2 squares Bakers Semi-Sweet Baking Chocolate, melted, cooled slightly

Preheat oven to 350 degrees. 

Line 13x9 inch baking  pan with foil, with ends of foil extending over sides of pan. Spray with cooking spray.  Prepare brownie batter as directed on package.  Pour into prepared pan. Bake 15 min. or until top of brownie is shiny or almost set.

MEANWHILE, Beat cream cheese, sugar and vanilla in large bowl with electric mixer on Medium speed until well blended. Add sour cream; mix well. Add eggs, 1 at a time, mixing on low speed after each addition just until blended. Pour over partially-baked brownie batter in pan. (filling will come almost to the top of pan.)

BAKE 40 min. or until center is almost set. Run knife or spatula around rim of pan to loosen cake; cool.  Refrigerate 4 hours or overnight. Let stand at room temperature 30 min. before serving. Lift cheesecake from pan using foil handles. Drizzle with chocolate; Let stand until chocolate is firm. Cut into 16 pieces to serve. Store leftover cheesecake in refrigerator.