01 - Preheat the oven to 350°F. Line a 12-cup muffin tray with paper liners or lightly grease the cups.
02 - In a large bowl, whisk together mashed bananas, eggs, melted coconut oil or butter, honey or maple syrup, and vanilla extract until smooth and well blended.
03 - In a separate bowl, combine rolled oats, flour, baking soda, baking powder, cinnamon, and salt. Whisk to distribute evenly.
04 - Pour the dry ingredients into the wet ingredients. Stir gently with a spatula until just combined, taking care not to overmix as this can result in dense muffins.
05 - Fold in chopped nuts or chocolate chips if desired, incorporating them evenly throughout the batter.
06 - Divide the batter evenly among the prepared muffin cups, filling each about 3/4 full to allow for proper rising during baking.
07 - Bake for 18 to 22 minutes, or until a toothpick inserted into the center of a muffin comes out clean with no wet batter attached.
08 - Let the muffins cool in the pan for 5 minutes before transferring them to a wire rack to cool completely.