Preheat oven to 350 degrees F.
Combine butter and sugar until well mixed.
Add eggs, vanilla and sour cream. Mix again very well. Make sure to scrape the sides of the bowl.
In a separate bowl combine the flour, salt, baking powder and cinnamon.
Add the flour mixture to the butter mixture in two increments.
Toss cinnamon chips in 1 tablespoon flour. Gently fold them into the batter.
Pour into 5 prepared mini loaf pans.
Mix the 1/3 cup sugar with the 2 teaspoons cinnamon. Sprinkle on top of batter.
Bake for 30 - 35 min. Watch closely at the end so the outside doesn't get too done.