Double Chocolate Banana Bread (with Dark Chocolate)

Oh, what a treat this is!  Super chocolaty and moist!  And the dark chocolate gives it such an amazing unique taste.  Delicious, delicious, delicious!  Enjoy!
-3 ripe bananas
-3/4 cup packed brown sugar
-1/2 cup sour cream
-1 tsp vanilla extract
-1 egg
-1/2 cup unsweetened cocoa powder
-1 tsp baking soda
-1/4 tsp salt
-1 cup flour
-1 cup dark chocolate chips
Preheat oven to 350 F.  Coat a 9x5 loaf pan with baking cooking spray.  Set aside.
In your mixer's bowl, add bananas (just broken in halves) and brown sugar.  Mix until smooth.  With the mixer on low, add the sour cream, vanilla and egg.  Increase speed and beat until well mixed.  Lower the speed and add cocoa powder, baking soda, salt and flour.  Mix very well.  Stir in the chocolate chips.
Pour mixture into prepared pan and bake in preheated oven for 55-65 minutes or until the toothpick comes out clean.
Remove from oven and cool in pan for 10 minutes.  Place on wire rack and cool completely.  Slice and enjoy!