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 incorporated.
03 - In a separate bowl, combine rolled oats, all-purpose flour, baking soda, baking powder, ground cinnamon, and salt. Whisk to ensure even distribution.
04 - Add the dry ingredients to the wet ingredients. Stir gently with a spatula until just combined, being careful not to overmix as this can result in dense muffins.
05 - Gently fold in chopped nuts or chocolate chips if desired, distributing them evenly throughout the batter.
06 - Divide the batter evenly among the prepared muffin cups, filling each approximately three-quarters full.
07 - Bake for 18 to 22 minutes, or until a toothpick inserted into the center of a muffin comes out clean.
08 - Allow muffins to cool in the pan for 5 minutes, then transfer to a wire rack to cool completely before serving.