Confectioners Sugar Brownies

1 lb Powdered Sugar
1/2 c Butter or Margarine
4 Chocolate Squares, melted
4 Eggs, well beaten
1 ts Vanilla
1 1/2 c Flour
1 c Walnuts, chopped Cream sugar and butter until light and fluffy.
Add melted chocolate and vanilla, beat well.
Add eggs and stir in flour. Fold in nuts. Grease and flour a 9x13 pan. Preheat oven to 350 degrees F and bake for 25-30 minutes. Cool and cut. Do Not Overbake.