In a mixing bowl, whisk together all-purpose flour, baking powder, cinnamon, nutmeg, and granulated sugar until uniform in texture.

In another bowl, whisk together eggs, milk, melted butter, and vanilla extract until well combined and smooth.

Gently pour the wet mixture into the dry ingredients, combining just until mixed. Fold in diced apples without overmixing.

Preheat your waffle iron and lightly grease it to prevent sticking.

Spoon 1/2 cup of batter into the preheated waffle iron and cook for 3 to 4 minutes or until golden brown.

While the donuts cook, whisk together powdered sugar and milk in a small bowl until smooth to prepare the glaze.

Remove the waffles from the iron and drizzle with glaze before serving. Allow it to set slightly.