CAKE:

1 box Duncan Hines yellow cake mix
1 c. sour cream
4 eggs
1/2 c. oil
1 pkg. vanilla instant pudding & pie filling
1 tsp. vanilla

FILLING & TOPPING:

1/2 c. sugar
1/2 tsp. cinnamon
1 sq. grated unsweetened chocolate

TOPPING ONLY:

Miniature chocolate chips

Pour half batter in Springform pan. Sprinkle half of cinnamon mixture over batter. Pour in remaining batter, then remaining cinnamon mixture. Top with chocolate chips. Bake at 350 degrees for 40 to 50 minutes.