1. In a small mixing bowl, beat the cream cheese, sugar, egg and vanilla until smooth; set aside.
2. For brownie layer, combine butter, sugars and cocoa in a large mixing bowl; blend well. Add eggs, one at a time, beating well after each addition. Combine flour and baking powder; stir into the cocoa mixture. Stir in vanilla and cookie crumbs. Pour into a greased 11 x 7 x 2 inch baking pan. Spoon cream cheese mixture over batter; cut through batter with a knife to swirl. Bake at 350 for 25-30 minutes or until a toothpick inserted near the center comes out with moist crumbs. Cool completely.