1 pkg. Duncan Hines brownie mix
2 eggs  
2 pkgs.(3 oz.) cream cheese, softened
2 Tbsp. flour
5 Tbsp. butter, softened                                                       
3/4 tsp. vanilla extract
1/3 cup sugar
 
Preheat oven to 350 degrees.  Grease bottom of 9x13 pan.  Place softened cream cheese and butter in medium bowl and beat at low speed until creamy.  Add sugar, eggs, flour and vanilla; beat until smooth and set aside.  Prepare brownie mix using basic recipe, cake-like variation.  Spread half of brownie batter into greased pan.  Pour all of cream cheese mixture over brownie batter in spots over top.  Swirl two mixtures together with a knife.  Bake at 350 for 36 to 39 minutes or until  set.   I would check at 25 minutes because different ovens cook quicker or slower.      Frost  with the following icing recipe.  

ICING RECIPE
 
Melt together and bring to a boil                        
1 stick of margarine
4 Tablespoons of Cocoa
6 Tablespoons of milk
 
Take off heat and add 1 teaspoon vanilla and 1 box powdered sugar