1Heat oven to 350°F (325°F for dark or nonstick pan). Generously grease 12-cup fluted tube cake pan with shortening and lightly flour, or spray with baking spray with flour.
2In large bowl, mix cake mix, chocolate milk, butter, eggs, sour cream and dry pudding mix with spoon until well blended (batter will be very thick). Stir in 2 cups chocolate chips. Spoon into pan.
3Bake 56 to 64 minutes or until top springs back when touched lightly in center. Cool 10 minutes. Turn pan upside down onto cooling rack or heatproof serving plate; remove pan. Cool completely, about 2 hours.
4Place 1 cup chocolate chips in small heatproof bowl. In 1-quart saucepan, heat whipping cream to simmering; pour over chips. Let stand 5 minutes; stir until smooth. Drizzle glaze over cake. Sprinkle with 1 1/2 cups chocolate chips. Drizzle caramel topping over cake. Sprinkle with toffee bits and chopped candy. Store loosely covered at room temperature.