Instructions: Preheat oven to 350 degrees. Grease and line an 8 or 9 inch square baking pan with foil. Grease foil and set aside. Beat together butter, brown sugar, egg and vanilla until light and fluffy. Add in flour, baking soda and salt. Mix well. Stir in half the chopped semi-sweet and white chocolates. Stir in half the walnuts. Bake 25 minutes or until toothpick comes out clean. Remove from oven & immediately sprinkle with remaining semi-sweet and white chocolates. Cover with foil and set aside to let melt.

Swirl chocolates with knife to marbleize. Sprinkle with remaining walnuts and cool in pan. Cut into bars.

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