Preheat a waffle iron on medium heat.

In a large bowl, sift together flour, baking powder, sugar, salt, and cinnamon.

In another bowl, whisk together the eggs, melted butter, and milk.

Pour the liquid ingredients into the dry ingredients and quickly fold together just until the flour is moistened.

Spray the waffle iron with non-stick spray and pour in the batter. Cook until steam is no longer rising from the waffle iron.