Two-Toned Walnut Jumbles
["1/2 c. shortening", "1 c. brown sugar, packed", "1/2 c. granulated sugar", "1 tsp. vanilla", "2 eggs", "1 1/2 c. chopped walnuts, divided", "2 3/4 c. all-purpose flour", "1/2 tsp. baking soda", "1 tsp. salt", "1 c. sour cream", "1 (1 oz.) sq. unsweetened chocolate, melted"]
["Beat together shortening, sugars and vanilla.", "Add eggs; continue beating until fluffy.", "Stir in 1 cup of the walnuts.", "Sift flour together with soda and salt; add to creamed mixture alternately with sour cream.", "Divide dough into halves, in separate bowls.", "Stir melted chocolate into one of the bowls of dough."]
["shortening", "brown sugar", "sugar", "vanilla", "eggs", "walnuts", "flour", "baking soda", "salt", "sour cream", "unsweetened chocolate"]