Preheat the oven: Set it to 350°F and line a 12-cup muffin pan with paper liners or lightly grease each cup.
Mix the dry ingredients: In a large bowl, whisk together the flour, oats, baking powder, baking soda, salt, cinnamon, and nutmeg.
Combine the wet ingredients: In a separate bowl, beat the eggs, then add the applesauce (or banana), maple syrup, yogurt, milk, and vanilla. Stir until well blended.
Mix the batter: Pour the wet mixture into the dry ingredients and stir just until everything is combined. Don’t overmix.
Fold in the extras: Gently stir in the dried fruit and nuts. Let the batter rest for 5–10 minutes to thicken slightly.
Fill the muffin tin: Divide the batter evenly among the 12 muffin cups. Top with extra oats, dried fruit, or nuts if desired.
Bake the muffins: Bake for 20–22 minutes, or until a toothpick inserted into the center of a muffin comes out mostly clean with a few moist crumbs.
Cool and enjoy: Let the muffins cool in the pan for 5 minutes, then transfer to a wire rack. Serve warm or store for later.