In a large mixing bowl, whisk together 2 cups of all-purpose flour, ½ cup of granulated sugar, 1 tablespoon of baking powder, ½ teaspoon of salt, and 1 teaspoon of ground cinnamon.

In a separate bowl, mix together 1 cup of milk, 2 large eggs, ½ cup of melted butter, and 1 teaspoon of vanilla extract until smooth.

Gently fold the wet ingredients into the dry mixture using a spatula, being careful not to overmix.

Carefully incorporate 1 to 1.5 cups of peeled and diced apples into the batter.

Preheat your waffle iron and lightly grease the plates with vegetable oil.

Spoon a generous amount of the batter onto the preheated waffle iron, spreading it evenly to fill the plates.

Once cooked, carefully remove the waffle donuts from the iron and place them on a wire rack to cool slightly.

Using a donut cutter, cut out donut shapes from the cooled waffle donuts.

In a deep pot, heat vegetable oil to 350°F (175°C).

Gently place the donut-shaped waffles into the hot oil in batches, frying for about 2-3 minutes on each side.

In a bowl, whisk together 1 cup of powdered sugar, 2 tablespoons of milk, and ½ teaspoon of vanilla extract until smooth and pourable.

Dip each cooled donut in the glaze, allowing the excess to drip off before placing them back on the wire rack.