Preheat and prep: Heat your oven to 375°F (190°C).
Line a 12-cup muffin tin with paper liners or lightly grease it. This helps the muffins release cleanly and brown evenly.
Whisk dry ingredients: In a large bowl, whisk the flour, baking powder, baking soda, cinnamon, nutmeg, and salt. This ensures even distribution of leavening and spices.
Mix wet ingredients: In a separate bowl, whisk the oil, applesauce, maple syrup, eggs, and vanilla until smooth.
Stir in the milk until combined.
Combine gently: Pour the wet mixture into the dry ingredients. Stir with a spatula until just combined. The batter should be thick but scoopable.
Avoid overmixing to keep the muffins tender.
Fold in the apples: Add the diced apples and fold gently until evenly dispersed. Make sure the pieces are small so they cook through and don’t weigh down the crumb.
Fill the pan: Divide the batter among the muffin cups, filling each about 3/4 full. If using, sprinkle turbinado sugar or oats on top for texture.
Bake: Place the tray on the middle rack and bake for 16–20 minutes, or until the tops are set and a toothpick inserted in the center comes out clean or with a few moist crumbs.
Cool: Let the muffins cool in the pan for 5 minutes, then transfer to a wire rack.
Cooling helps set the structure and keeps the bottoms from getting soggy.
Serve: Enjoy warm or at room temperature. They’re great plain, with a pat of butter, or a swipe of almond butter.