In a large mixing bowl, whisk together the dry ingredients: flour, sugar, baking powder, salt, and cinnamon until lump-free.

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

Gently pour the wet mixture into the dry ingredients, stir until just combined, being careful not to overmix.

Fold in the diced apples into the batter and distribute evenly.

Preheat your waffle iron according to the manufacturer’s instructions and lightly grease it with vegetable oil.

Spoon about 1/2 cup of batter onto the heated waffle iron and cook for about 4-5 minutes until golden brown.

Remove the waffles and cool on a wire rack to allow steam to escape.

Cut out the center of each waffle using a donut cutter.

Heat vegetable oil in a deep pot to 350°F and fry each donut for about 2-3 minutes per side until browned.

Drain the donuts on paper towels to soak up excess oil.

Whisk together the glaze ingredients until smooth and adjust the milk as needed.

Dip each donut into the glaze and place them back on the wire rack to set.