Heat oven to 350. Spray a bundt pan w/ cooking spray. In small bowl, mix together 2 tbsp cake mix, chocolate chips, brown sugar and cinnamon.
In lg bowl, beat cake mix, oil, sugar, eggs and sour cream until smooth. Pour 2/3 mix into pan. Sprinkle w/ reserved chocolate chip mix. Top w/ remaining batter. Bake about 45 mins,or until a toothpick inserted in center comes out clean.