Preheat oven to 350F. Grease and flour 13x9x2 inch baking pan; set aside. Melt butter in large saucepan over low heat. Remove from heat. Add sugars and vanilla; blend well. Add eggs, 1 at a time, beating well after each addition. Add flour; blend well. Stir in nuts. Pour into prepared pan. Bake 40 minutes. Turn out onto wire rack. Sprinkle confectioners sugar over top. Let stand until cool. Cut into squares.
Cajun Country -- New Iberia, Louisiana