Prep your pan and oven. Heat the oven to 350°F (175°C).
Line a mini muffin pan with liners or grease it well. This recipe makes about 24 mini muffins or 10–12 standard muffins.
Mix the wet ingredients. In a large bowl, whisk together applesauce, grated apple, milk, oil (or butter), egg, maple syrup (or honey), and vanilla until smooth and combined.
Combine the dry ingredients. In a separate bowl, stir flour, baking powder, baking soda, cinnamon, and salt. This helps the leavening distribute evenly.
Bring it together gently. Add the dry mix to the wet mix.
Stir with a spatula just until no streaks of dry flour remain. Don’t overmix, or the muffins can turn tough.
Fold in optional add-ins. If using raisins, pears, or grated carrot, fold them in now. Keep pieces small for toddler-safe bites.
Portion the batter. Scoop the batter into the prepared pan.
Fill mini muffin cups almost to the top and standard cups about 3/4 full.
Bake. Bake mini muffins for 12–15 minutes and standard muffins for 16–19 minutes. They’re done when the tops spring back and a toothpick comes out clean or with a few moist crumbs.
Cool. Let muffins rest in the pan for 5 minutes, then move to a wire rack to cool completely. Cooling helps them set and stay moist.
Serve. Offer plain or with a thin smear of cream cheese, yogurt, or nut/seed butter for extra protein and healthy fats.