Cinnamon Sugar Blueberry Banana Bread

granulated sugar, divided

unsalted butter, softened

salt

overripe bananas

large eggs

sour milk (make sour milk by adding 1 teaspoon vinegar to 6 1/2 tablespoons nonfat milk)

vanilla extract

baking soda

all purpose flour

fresh or frozen blueberries (if using frozen, be sure to remove any ice crystals)

cinnamon