Preheat oven to 375 degrees F, line 12 muffin tin with parchment paper liners and spray with cooking spray. Set aside.
In a large mixing bowl, add bananas and mash with a fork. Add the egg, yogurt, maple syrup, oil, vanilla extract, cinnamon, baking powder, baking soda and salt; whisk well to combine.
Add flour, gently stir until well incorporated but do not overmix. Let batter sit for a few minutes to absorb the flour, add chocolate chips and stir a few times.
Using an ice cream scoop, fill each opening of a muffin tin 3/4 full and add a few extra chocolate chips on top (optional). Bake on a middle rack for 20 minutes or until a toothpick inserted in the center comes out clean.
Let muffins cool for about 5 minutes and enjoy!
Notes
Store: Covered in a cool dry place for 2 days. Then refrigerate in an airtight container for another 3 days.
Freeze: Freeze for up to 3 months. To thaw just remove muffins from the freezer and let defrost for a few hours or overnight on a counter.
Bananas: Choose very ripe bananas that are yellow with many brown spots to brown patches. Bruised bananas are even better. Scary looking brown bananas are awesome.
Liquid sweetener: Not dry sweetener like sugar please. You have to keep dry to wet ingredients ratio.
Yogurt: You can use 0% yogurt, however muffins will be less moist. Regular (not Greek) yogurt will work as well, so will sweetened or unsweetened applesauce.
Other sizes: Bake mini banana muffins for 15 minutes and do a toothpick test. Bake longer, if necessary.