1 pkg. Duncan Hines fudge marble cake mix
1/4 c. water
2 eggs
1/4 c. butter, soft
1 c. semi-sweet chocolate chips
1 tbsp. water
1/2 c. walnuts, chopped

Heat oven to 350 degrees. Grease 9 x 13 pan. Set aside cocoa packet and combine cake mix, 1/4 cup water, eggs, and butter. In large bowl, beat at low speed with electric mixer until blended. Measure 1/2 cup batter into small bowl, add cocoa packet, chocolate chips, and 1 tablespoon water. Stir until blended. Add nuts to yellow batter. Spread in pan. Spoon chocolate batter randomly on top. Swirl with knife. Bake for 22 minutes. Cool; cut into bars.