01 - Preheat the oven to 350°F. Line a 12-cup muffin tray with paper liners or lightly grease with cooking spray.
02 - In a large mixing 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 of leavening agents.
04 - Pour dry ingredients into the wet mixture. Fold gently using a spatula until just combined. Stop mixing as soon as flour streaks disappear to prevent tough muffins.
05 - Gently fold in chopped nuts or chocolate chips if desired, distributing evenly throughout the batter.
06 - Divide batter evenly among the prepared muffin cups, filling each approximately three-quarters full. Use a cookie scoop or measuring cup for uniform portions.
07 - Bake for 18 to 22 minutes, or until a toothpick inserted into the center of a muffin emerges clean or with just a few moist crumbs.
08 - Let muffins cool in the pan for 5 minutes before transferring to a wire rack. Cool completely before storing to maintain texture.