Start by mashing the ripe bananas in a large mixing bowl until mostly smooth. A few small lumps are fine
To the mashed bananas, whisk in the egg, milk, honey, melted coconut oil, and vanilla extract. Stir until everything is well combined
Add the oats, baking powder, baking soda, cinnamon, and salt. Gently mix until everything is evenly incorporated.
If you’d like, fold in chocolate chips, chopped walnuts, or even a handful of blueberries for a little extra flavor.
Let the batter sit for 10–15 minutes before baking. This step helps the oats soak up some of the moisture, making the muffins more tender and less crumbly.
Preheat your oven to 375°F (190°C) and line a muffin tin with paper liners or lightly grease it.
Divide the batter evenly among 12 muffin cups, filling each about ¾ full.
Bake for 20–22 minutes, or until the tops are golden brown and a toothpick inserted in the center comes out clean.
Let the muffins cool in the pan for 5 minutes before transferring them to a wire rack.