In a large mixing bowl, whisk the flour, sugar, baking powder, and salt together until well combined. Set aside.
In a separate large mixing bowl, whisk together the milk, oil, vanilla extract, and egg yolks until fully combined. Add the dry ingredients to the wet ingredients and mix together until just combined.
Add the egg whites to a clean mixing bowl and beat to stiff peaks.
Gently fold the egg whites into the batter until just combined.
Spray the waffle maker well with nonstick cooking spray. Scoop or pour some of the batter onto the hot waffle iron (the amount will depend on your waffle maker), close the lid, and cook according to your waffle maker’s instructions or until crisp and golden brown. Repeat with the remaining batter.
Serve warm with pure maple syrup, fresh fruit, or toppings of choice.
Video
Notes
Storage instructions: Let waffles cool completely, then store in an airtight container in the fridge for up to five days. To reheat, warm in the microwave in 20-second intervals or in the toaster.Freezing instructions: Let the waffles cool completely, then place on a parchment paper-lined baking tray. Freeze the waffles on the tray until hardened (about 1 hour) and then seal in a freezer bag for up to three months. To reheat, warm in the microwave in 20-second intervals or place in the toaster (you may need to toast them at a lower heat for a few rounds if reheating from frozen). Eggs: To bring your eggs to room temperature quickly, place them in a bowl of warm water for 5 to 10 minutes.