01 -
Heat the waffle iron to a medium-high setting according to the manufacturer's instructions.
02 -
In a medium bowl, whisk together the whole milk, egg yolks, vegetable oil, and vanilla extract until well combined.
03 -
In a large bowl, whisk together the all-purpose flour, cornstarch, light brown sugar, cinnamon, nutmeg, baking powder, baking soda, and salt until evenly distributed.
04 -
In a separate bowl, beat the egg whites using an electric mixer until stiff peaks form.
05 -
Pour the wet mixture into the bowl with the dry ingredients and stir gently until just combined, scraping the bottom of the bowl to incorporate all dry flour.
06 -
Gently fold the whipped egg whites into the batter, taking care to maintain the mixture's volume for lightness.
07 -
Spoon the batter into the preheated waffle iron, filling each cavity two-thirds to three-quarters full. Close the lid and cook until golden and crisp, about 5 minutes per batch. Repeat with remaining batter.
08 -
Serve the waffles warm with maple butter and warmed maple syrup.