Prep the pan and oven: Preheat your oven to 350°F (175°C). Grease a 12-cup muffin tin or line with paper liners.
For toddlers, mini muffins are great—use a 24-cup mini muffin pan and reduce bake time slightly.
Mash the bananas: In a large bowl, mash the ripe bananas until mostly smooth. A few small lumps are fine.
Whisk in wet ingredients: Add eggs, yogurt, maple syrup or honey (if using), vanilla, and melted butter or oil. Whisk until well combined.
Add dry ingredients: Sprinkle in rolled oats, whole wheat flour, baking powder, baking soda, cinnamon, and salt.
Stir gently until just combined. The batter will be thick.
Fold in extras: If using fruit or veggies, fold them in now. Keep pieces small for even baking and easy chewing.
Fill the cups: Divide the batter evenly among the muffin cups, filling each about 3/4 full.
For mini muffins, aim for about 2/3 full.
Bake: Bake standard muffins for 16–20 minutes, or mini muffins for 10–13 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 to cool completely. This helps them set and prevents soggy bottoms.
Serve: Offer plain, or with a thin smear of nut butter, cream cheese, or yogurt for extra protein and fats.