Cream Cheese Brownies
["1 c. butter", "4 (1 oz.) sq. unsweetened chocolate", "2 1/2 c. sugar, divided", "1 c. flour", "4 eggs", "1/2 tsp. salt", "2 c. walnuts", "2 tsp. vanilla, divided", "1 (8 oz.) pkg. cream cheese, softened"]
["Preheat oven to 350\u00b0.", "Grease a 9 x 13-inch baking dish.", "In a 2-quart saucepan, melt butter and chocolate over low heat.", "With wire whisk, beat in 2 cups sugar and 3 eggs until blended.", "Stir in flour, salt, nuts and 1 teaspoon vanilla.", "Spread evenly in pan.", "Beat cream cheese, remaining 1/2 cup sugar, 1 egg and 1 teaspoon vanilla until well blended, about 3 minutes.", "Drop 6 dollops of cream cheese mixture on top of batter.", "Swirl with a spatula to marbleize.", "Bake 40 to 45 minutes or until toothpick inserted in center comes out clean.", "Cool pan on wire rack.", "Cut when completely cool."]
["butter", "unsweetened chocolate", "sugar", "flour", "eggs", "salt", "walnuts", "vanilla", "cream cheese"]