Preheat oven to 350 degrees.
With a hand mixer or in a stand mixer, combine the butter and sugar until well blended.
Add the eggs, one at a time, and incorporate well.
In a separate bowl, combine the flour, baking powder, baking soda and cinnamon.
Combine the flour mixture with the butter mixture just until blended.
Mix in the sour cream.
Spray a 9″ x 13″ pan with non-stick spray, then pour the batter into the pan.
Scatter the chocolate chips over the top of the batter and sprinkle with 2 Tbsp. sugar.
Bake at 350 degrees for 35 minutes or until the cake is light brown and begins to pull away from the pan.
Store at room temperature – do not refrigerate.