Whisk together flour, cinnamon, baking powder, and salt in a bowl.
In a separate bowl, whisk together egg, sugar, milk, butter, and vanilla extract.
Blend the dry ingredients into the wet mixture.
Lightly coat a waffle iron with cooking spray.
Ladle batter into the iron and cook for about 5-7 minutes.
Whisk together powdered sugar and cinnamon in a bowl and dust over waffles to serve.