Preheat your waffle iron to a medium high-high setting.
In a medium bowl whisk together the milk, egg yolks, oil, and vanilla. Set aside.
In a large bowl whisk together the flour, cornstarch, brown sugar, cinnamon, nutmeg, baking powder, baking soda, and salt. Set aside.
In a third bowl beat the egg whites with a handheld electric mixer until stiff peaks form.
Combine the wet ingredients into the dry ingredients until just combined, making sure to scrape the bottom of the bowl. Gently fold in the whipped egg whites.
Fill your waffle irons until they are 2/3-3/4 full of batter, close the lid and cook until the waffles are crisp on the outside (this took 5 minutes in my waffle maker. I like to use a ladle, measuring cup, or portion scoop so that all of the waffles have the same amount of batter.) Repeat the cooking process until all batter is used.
Serve the waffles warm with maple butter and warmed maple syrup.