Heat the oven to 375 F and line a 12 cup muffin pan with papers.
Whisk flour baking powder cinnamon nutmeg and salt in a large bowl.
Whisk eggs sugar oil apple cider and vanilla in a second bowl until smooth.
Tip wet mix into dry mix and stir with a spatula until the flour looks just moistened.
Fold in the diced apple with light strokes so the batter stays airy.
Scoop into cups and fill each about three quarters full. Sprinkle turbinado sugar if you like a crisp top.
Bake 16 to 20 minutes until the tops spring back and a tester comes out clean.
Cool five minutes in the pan then move muffins to a rack. Eat warm or at room temperature.