Brownie layer:
1/2 C. butter, melted
1/2 C. sugar
1/2 C. packed brown sugar
1/2 C. baking cocoa
2 eggs
1/2 C. all-purpose flour
1 tsp. baking powder
1 tsp. vanilla
12 cream-filled chocolate sandwich cookies, crushed

In a small mixing bowl, beat the cream cheese, sugar, egg and
vanilla until smooth; set aside. 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 11x7x2-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.