Chocolate Chip Coffee Cake
["1 c. butter", "1/2 c. brown sugar", "1/2 c. white sugar", "3 eggs", "1 tsp. vanilla extract", "3 c. flour", "1 Tbsp. baking soda", "1/2 tsp. salt", "1/2 c. walnuts, chopped", "1 tsp. cinnamon", "1 (12 oz.) pkg. semi-sweet chocolate chips", "1 c. sour cream"]
["Preheat oven to 350\u00b0."]
["butter", "brown sugar", "white sugar", "eggs", "vanilla extract", "flour", "baking soda", "salt", "walnuts", "cinnamon", "semi-sweet chocolate chips", "sour cream"]