Prep your pan and oven: Heat the oven to 350°F (175°C).
Line a 12-cup muffin tin with paper liners or lightly grease it.
Mash the bananas: In a large bowl, mash the bananas with a fork until mostly smooth. A few small lumps are fine.
Whisk in the wet ingredients: Add eggs, honey, oil (or melted butter), and vanilla. Whisk until well combined and glossy.
Combine the dry ingredients: In a separate bowl, stir together oats, flour, baking powder, baking soda, cinnamon, and salt.
Bring it together: Add the dry ingredients to the banana mixture.
Stir gently until just combined. If using chocolate chips, nuts, or blueberries, fold them in now. Do not overmix.
Fill the cups: Divide the batter evenly among the 12 muffin cups.
Sprinkle a few oats on top for a simple finish.
Bake: Place in the center of the oven and bake for 16–20 minutes, or until the tops are set and a toothpick comes out clean or with a few moist crumbs.
Cool: Let muffins rest in the pan for 5 minutes, then transfer to a wire rack to cool completely. This helps them set and prevents sogginess.