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 combined.
03 - In a separate bowl, mix rolled oats, flour, baking soda, baking powder, cinnamon, and salt until evenly distributed.
04 - Add dry ingredients to wet ingredients and stir gently until just combined. Be careful 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 batter evenly among the muffin cups, filling each about 3/4 full to allow for rising during baking.
07 - Bake for 18 to 22 minutes, or until a toothpick inserted into the center of a muffin comes out clean and the tops are golden brown.
08 - Let muffins cool in the pan for 5 minutes, then transfer to a wire rack to cool completely before serving or storing.