Prep your pan and oven: Heat the oven to 350°F (175°C).
Line a 12-cup muffin tin with paper liners or grease well. For toddlers, consider mini muffins; oil the mini pan lightly.
Mash the bananas: In a large bowl, mash bananas until mostly smooth with a few small lumps. Measure to ensure about 1 1/4 cups.
Whisk the wet ingredients: Add yogurt, oil, honey or maple (if using), vanilla, and egg.
Whisk until creamy and well combined.
Combine the dry ingredients: In a separate bowl, stir flour, baking powder, baking soda, cinnamon, and salt until even. This helps prevent clumps.
Mix the batter gently: Add dry ingredients to wet. Stir with a spatula just until no dry streaks remain. Do not overmix or the muffins may turn dense.
Fold in add-ins: If using fruit or chocolate chips, fold them in gently.
For frozen berries, add straight from the freezer to avoid streaking.
Fill the cups: Divide batter evenly. For standard muffins, fill about 3/4 full. For mini muffins, fill nearly to the top.
Bake: Standard muffins take about 16–20 minutes; mini muffins take 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. Cooling helps set the crumb so they’re easier for little hands to hold.
Serve: Serve plain or with a thin smear of yogurt, nut butter, or cream cheese for extra protein and fat.