Preheat your Belgian waffle maker to medium-high.
In a large bowl, whisk together flour, baking powder, sugar, salt, and cinnamon.
2 ¼ cups all-purpose flour, 1 tablespoon baking powder, ¼ cup granulated sugar, ½ teaspoon kosher salt, 1 teaspoon ground cinnamon
In a separate medium sized bowl or stand mixer, beat the egg whites with a hand mixer until stiff peaks form, do not go further once they make stiff peaks or they'll break. Set aside.
2 large eggs
In a large measuring cup (or another medium sized bowl) whisk together the egg yolks, vegetable oil, milk, and vanilla extract.
½ cup vegetable oil, 2 cups milk, 2 teaspoon vanilla extract, 2 large eggs
Whisk the wet mixture into the dry ingredients and mix until most of the lumps are gone, then gently fold in the egg whites with a rubber spatula.
Pour the batter into your ready preheated waffle iron and cook according to the waffle iron's directions.
Place the cooked waffles onto a wire rack to cool (so they don't get soggy) and continue with the next batch.
Serve warm with your favorite toppings.