Whisk together flour, cinnamon, baking powder, and salt in a bowl.
In a separate bowl, whisk together egg, sugar, milk, and butter.
Blend the dry ingredients into the wet mixture.
Fold the diced apples into the batter.
Lightly coat a waffle iron with cooking spray.
Ladle batter into the iron and cook for about 5-7 minutes.
Whisk together ingredients for the glaze in a bowl and drizzle over hot waffles.