In a large mixing bowl, whisk together 2 cups of all-purpose flour, ½ cup of granulated sugar, 1 tablespoon of baking powder, and a pinch of salt until well combined.

In a separate bowl, beat 2 eggs until frothy, then mix in ¾ cup of milk, ¼ cup of melted unsalted butter, and 1 teaspoon of vanilla extract.

Gently fold the wet ingredients into the dry ingredients until just combined.

Fold in 1 cup of diced apples, 1 teaspoon of ground cinnamon, and a pinch of nutmeg into the batter.

Preheat your waffle maker according to the manufacturer's instructions and lightly grease it with oil.

Pour the batter into the preheated waffle maker, using about ½ cup for each donut shape, and close the lid. Cook for approximately 3–5 minutes.

While the donuts are cooking, whisk together 1 cup of powdered sugar, 2 tablespoons of milk, and ½ teaspoon of vanilla extract in a small bowl until smooth.

Remove the waffles from the maker and let them cool slightly. Drizzle the glaze generously over the warm donuts just before serving.