Preheat oven to 375°F and line a muffin tin with liners. In a bowl, whisk flour, baking powder, baking soda, cinnamon, and salt.
In a large bowl, combine eggs, sugar, melted butter (or oil), milk, and vanilla.
Add dry ingredients to the wet ingredients. Add apples on top of the flour mixture and toss the apples in the flour. Then gently fold dry ingredients into wet until just combined. Don’t over mix.
Scoop muffin batter into prepared muffin pan, filling until about full. Mix sugar and cinnamon, then sprinkle over each muffin.
Bake for 18–22 minutes or until a toothpick or cake-tester comes out clean. Cool on a rack and enjoy warm!
Notes
Use a sweet-tart apple variety like Honeycrisp, Fuji, or Pink Lady for best flavor.
For extra fall spice, add a pinch of nutmeg or allspice.
These muffins freeze well—wrap individually and thaw at room temperature or reheat in a warm oven.