Preheat your oven to 350 degrees F. Lightly grease two large 5 x 9-inch loaf pans with cooking spray and set aside.
In a large bowl, cream together butter, sugar, cinnamon, and salt using a hand mixer until fluffy. Add eggs and mix well. Then add sour cream and vanilla and mix well.
Mix flour and baking powder in a separate bowl. Add to wet ingredients and mix until all combined.
Add cinnamon chips and stir into batter. Set aside.
Spoon batter evenly into the prepared loaf pans.
To make the cinnamon-sugar mixture, mix sugar and cinnamon in a bowl and sprinkle over the batter in each loaf pan.
Tent pans with aluminum foil and bake for 40-45 minutes, or until a toothpick inserted into the middle comes out clean. Let cool before removing from pan and slicing.