Chocolate-Candy Cane Cake (aka the best Christmas cake ever!)

pkg (2-layer size chocolate cake mix)

pkg. (3.9 oz. JELL-O Chocolate Instant Pudding)

eggs

container (8 oz. BREAKSTONE'S Sour Cream)

oil

water

milk

pkg. (4 oz. BAKER'S Semi-Sweet Chocolate, chopped)

small candy canes (coarsely crushed (about 1 cup), divided)

tub (8 oz. COOL WHIP Whipped Topping, thawed)