Preheat the oven to 350 degrees. Spray mini loaf pans with cooking spray.
In a medium bowl combine the butter, sugar, brown sugar, eggs, and vanilla. Mix well.
Add the zucchini and mix until well combined.
In a large mixing bowl combine the flour, salt, baking powder, baking soda, and cinnamon.
Add the wet ingredients to the dry ingredients and mix until just combined.
Gently fold in the blueberries.
Spray 4 mini loaf pans or pan with 6-8 mini loaves in it with baking spray and then divide the batter evenly between the pans.
Bake for 30-40 minutes or until a toothpick comes out clean.
Cool completely on a wire rack.