Marbled brownies

MMMMM----- Recipe via Meal-Master (tm) v8.01
  
       Title: Marbled Brownies
  Categories: Brownies
       Yield: 24 servings
  
     1/2 c  Flour
     1/2 t  Baking powder
     1/4 t  Salt
       4 oz Unsweetened chocolate
       3 T  Unsalted butter
       2    Eggs
     3/4 c  Sugar
       1 t  Vanilla
     3/4 c  Coarsely chopped walnuts
       4 oz Cream cheese
       2 T  Unsalted butter
     1/2 t  Vanilla
     1/4 c  Sugar
       1    Egg
  
   (From "San Francisco Encore," by the Junior League of San Francisco.)
   
   Butter a 9" square pan. Sift together the flour, baking powder and
   salt. Set aside. Melt the chocolate with the butter. Remove from heat
   and let cool slightly. Beat the 2 eggs until foamy. Add the 3/4 cup
   sugar and 1 teaspoon vanilla. Continue beating until light
   lemon-colored. Beat in the chocolate mixture and then the dry
   ingredients. Mix well. Set aside 3/4 cup of the mixture. To the
   remainder, stir in 1/2 cup of the nuts. Spread this mixture into the
   prepared pan.
   
   Preheat oven to 350'F. Beat the cream cheese with the butter until
   smooth. Add the 1/2 teaspoon vanilla and 1/4 cup sugar and beat until
   fluffy. Beat in the 1 egg. Spread cheese mixture over the chocolate
   layer. Place heaping tablespoons of the reserved 3/4 cup chocolate
   mixture over the cheese, forming 8 or 9 mounds. With a small spatula
   of knife, cut through the mounds in a zigzag layer, going almost but
   not quite through the bottom. Sprinkle with the remaining 1/4 cup
   nuts. Bake for 35 minutes. Let stand at room temperature for a few
   hours before cutting.
   
   Makes 24 brownies.
  
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