In a large mixing bowl, whisk together the dry ingredients: all-purpose flour, baking powder, ground cinnamon, ground nutmeg, and granulated sugar.

In a separate bowl, beat together the wet ingredients: eggs, milk, melted butter, and vanilla extract until smooth.

Gently add the wet mixture to the dry ingredients, stirring until just combined, then fold in the diced apples.

Preheat your waffle iron according to the manufacturer’s instructions, greasing the plates well to prevent sticking.

Scoop about ½ cup of the batter into the preheated waffle iron, spreading it slightly. Cook for 3-4 minutes until golden brown.

While the donuts are cooking, prepare the glaze by whisking together powdered sugar and milk until smooth and pourable.

Carefully remove the cooked donuts from the waffle iron, drizzle with glaze, and serve warm.