Chocolate Zucchini Cake
["1/2 c. soft butter", "1/2 c. vegetable oil", "1 3/4 c. sugar", "2 eggs", "1 tsp. vanilla", "1/2 c. sour milk", "2 1/2 c. flour", "4 Tbsp. cocoa", "1/2 tsp. baking powder", "1 tsp. baking soda", "1/2 tsp. cinnamon", "1/2 tsp. ground cloves", "2 c. shredded zucchini", "1/2 c. chocolate chips, reserve for top"]
["Mix ingredients (except chocolate chips) in order listed. Grease and flour 9 x 12-inch pan.", "Place mixture in pan and sprinkle with chocolate chips.", "Bake at 325\u00b0 for 40 to 45 minutes."]
["butter", "vegetable oil", "sugar", "eggs", "vanilla", "sour milk", "flour", "cocoa", "baking powder", "baking soda", "cinnamon", "ground cloves", "zucchini", "chocolate chips"]