Grease a waffle iron with butter and preheat.
In a large bowl, whisk together flour, baking powder, salt, sugar, and cinnamon.
In a medium bowl, beat the eggs. Stir in the milk, oil, and vanilla.
Add the wet ingredients to the dry ingredients and mix just until combined.
Pour batter onto the hot waffle iron and cook according to manufacturer's directions.
Serve immediately with butter and syrup.
