Prep your pan: Heat the oven to 350°F (175°C). Grease a mini muffin tin or line with paper liners.
This recipe makes about 24 mini muffins or 10–12 standard muffins.
Mash the bananas: In a large bowl, mash bananas with a fork until mostly smooth. A few small lumps are fine.
Whisk in wet ingredients: Add eggs, yogurt, melted butter or oil, vanilla, and maple syrup or honey (if using). Whisk until well combined.
Add dry ingredients: Sprinkle oats, flour, baking powder, baking soda, cinnamon, and salt over the wet mixture.
Stir gently until just combined. Do not overmix.
Fold in extras: If using blueberries, grated carrot, or other add-ins, fold them in now. Batter will be thick.
Portion the batter: Spoon batter into the muffin cups, filling each about 3/4 full for even domes.
Bake: Bake mini muffins for 12–15 minutes and standard muffins for 16–20 minutes.
They’re done when a toothpick comes out clean or with a few moist crumbs.
Cool: Let muffins cool in the pan for 5 minutes, then transfer to a rack. Serve warm or at room temperature.
Serve to toddlers: For young toddlers, cut muffins into halves or quarters. Offer water on the side.