In a large mixing bowl, whisk together flour, sugar, baking powder, cinnamon, nutmeg, and salt.

In a separate bowl, whisk together milk, egg, melted butter, and vanilla extract until smooth.

Gently fold the wet ingredients into the dry mixture until just combined; do not overmix.

Fold in the diced, peeled apples carefully.

Preheat your waffle iron according to manufacturer's instructions, lightly greasing the plates.

Spoon the batter into the preheated waffle iron and cook for about 3-4 minutes or until golden brown.

In a small bowl, whisk together powdered sugar, milk, and vanilla extract to prepare the glaze.

Drizzle the glaze over warm donuts and let it set for about a minute.

Serve warm, enjoying them fresh.