Preheat oven to 375 degrees F and spray non-stick 12 muffin tin with cooking spray. Set aside.
In a large mixing bowl, mash bananas with a fork. Add egg, yogurt, maple syrup, oil, vanilla, baking powder, baking soda, salt, and whisk well to combine.
Add flour and gently stir with a spatula until well incorporated. Do not over mix otherwise muffins will be tough.
In a small bowl, toss blueberries with 1 tbsp flour, add to the batter and give a few stirs.
Divide batter between 12 openings of previously prepared muffin tin (I used trigger ice cream scoop) and you can also add a few blueberries on top. Bake for 20 minutes or until a toothpick inserted in the center comes out clean.
Let muffins cool for about 5 minutes and then transfer to a cooling rack to cool off more. Enjoy!
Notes
Store: Refrigerate in an airtight container for up to 1 week.
Freeze: In an airtight container or bag for up to 3 months. Thaw on a counter for a few hours or overnight.
Bananas: Choose very ripe bananas that are yellow with many brown spots to brown patches. If you like extremely moist muffins, use 4 bananas (2 cups).
Flour: Do not use all-purpose flour or coconut flour because all flours act differently. You may be OK with white whole wheat flour or wheat pastry flour.
Liquid sweetener: No dry sweetener like sugar please. You have to keep dry to wet ingredients ratio.
Yogurt: Use regular or Greek yogurt. 0% fat yogurt will produce more dry muffins but you can use it.