Preheat oven to 350 degrees F. Line a muffin pan with paper liners or spray with cooking spray. Set aside..
In a medium bowl, whisk together the flour, baking powder, baking soda, salt, and cinnamon. Set aside.
In a large bowl, combine mashed bananas, granulated sugar, brown sugar, egg, coconut oil, and vanilla. Stir until well combined. Add the flour mixture and stir gently with a rubber spatula until flour is mixed in. Squeeze the zucchini in a paper towel to remove excess liquid. Fold the zucchini into batter. Gently fold in the blueberries.
Pour the batter into prepared muffin cups, about 3/4 full. Sprinkle tops with turbinado sugar, if using. Bake until a toothpick inserted into the center comes out clean, 20-22 minutes. Cool muffins on a wire cooling rack. Enjoy!
Note-you can use all-purpose flour or regular whole wheat flour instead of white whole wheat flour. The muffins will keep covered for up to 3 days on the counter. The muffins also freeze well, store in a freezer bag in the freezer for up to 1 month. To reheat, place the muffins in the microwave for 30 seconds.