4 ounces unsweetened baking chocolate
1 cup butter
Cream Cheese Filling, (recipe follows)
2 cups sugar
2 tsp. vanilla
4 eggs
1 1/2 cups all-purpose flour
1/2 tsp. salt
1 cup coarsely chopped nuts

CREAM CHEESE FILLING
2 (8 ounce) packages cream cheese, softened
1/2 cup sugar
2 tsp. vanilla
1 egg

Heat oven to 350 degrees. Grease rectangular pan, 13 x 9 x 2 inches. Melt chocolate and butter over low heat, stirring frequently, until smooth; remove from heat. Cool 5 minutes. Meanwhile, prepare Cream Cheese Filling; set aside. Beat chocolate mixture, sugar, vanilla and eggs in large bowl with electric mixer on medium speed 1 minute, scraping bowl occasionally. Beat in flour and salt on low speed 30 seconds, scraping bowl occasionally. Beat on medium speed 1 minute. Stir in nuts. Spread half of the batter (about 2 1/2 cups) in pan. Spread Cream Cheese Filling over batter. Carefully spread remaining batter over filling. Bake 45 to 50 minutes or until toothpick inserted in center comes out clean. Cool completely. Cut into 8 rows by 6 rows. Store covered in refrigerator.

CREAM CHEESE FILLING:
Beat all ingredients with spoon until smooth.