Preheat your oven to 350°F (175°C) and line a muffin tin with paper liners or lightly grease with cooking spray.
In a large bowl, combine the whole wheat flour, wheat bran, baking soda, baking powder, salt, and ground cinnamon. Mix well.
In another bowl, mash the ripe bananas. Add the honey or maple syrup, egg, vanilla extract, Greek yogurt, and melted coconut oil. Mix until well combined.
Gradually add the dry ingredients to the wet ingredients, stirring gently until just combined. Be careful not to overmix the batter.
Gently fold in the fresh or frozen blueberries into the batter.
Spoon the batter into the prepared muffin tin, filling each cup about ¾ full.
Bake in the preheated oven for 18-22 minutes, or until a toothpick inserted into the center of a muffin comes out clean.
Allow the muffins to cool in the tin for a few minutes before transferring