Preheat your oven to 350°F (175°C) and spray five mini loaf pans with cooking spray.

In a medium bowl, whisk together the all-purpose flour, baking powder, salt, and cinnamon until well combined.

In a large mixing bowl, cream together the softened butter and sugar until fluffy, about 3-4 minutes. Add the eggs one at a time, mixing well.

Stir in the vanilla extract and sour cream until well combined.

Gently mix the dry ingredients into the wet ingredients until just combined.

Toss the cinnamon chips with additional flour and fold them into the batter.

Divide the batter among the prepared mini loaf pans, filling each about two-thirds full.

Mix additional sugar and cinnamon, then sprinkle over the batter in each loaf pan.

Bake for 35-40 minutes until a toothpick inserted comes out clean.

Let cool in the pans for 10 minutes before transferring to a wire rack to cool completely.