Preheat oven to 350-degrees F.

Spray loaf pan with non-stick cooking spray and flour pan.

Beat sugar and butter in large bowl until light.

Sift flour, baking powder and baking soda and add to butter mixture.

Beat until blended.

Add sour cream and vanilla.

Beat until blended.

Beat in eggs.

Spread half of batter into prepared pan.

Mix chocolate, cinnamon and 2 TB sugar in small bowl.

Sprinkle half of chocolate mixture over batter in pan.

Mix remaining chocolate mixture into remaining batter in bowl.

Pour remaining batter into pan.

With a knife, swirl chocolate mixture into batter.

Bake pound cake for 50-60 minutes or until toothpick (or other tester) comes out clean.

Let cool completely before serving.