In a smaller bowl, combine the oat milk with the apple cider vinegar. Stir it and set it aside to curdle.
Next, in a large bowl, add the flour, corn flour, rolled oats, baking soda, baking powder, and salt and stir.
Then separate the egg whites from the yolks into two different bowls. Make sure to place the egg whites into a larger bowl and use a hand mixer to beat it until it becomes fluffy and stiff.
Pour the curdled milk into the bowl of dry ingredients, along with the egg yolks and oil. Use a large spoon to mix it well until the batter is smooth. Allow the batter to sit for a few minutes to thicken.
Then add the beaten egg whites into the bowl and gently fold it into the batter with the spoon so that the batter remains fluffy instead of flat and smooth.
Cook the pancakes on a griddle or stove top pan on medium heat. Cook pancakes for 3-4 minutes on each side. If using a cast iron pan, make sure to oil or melt butter in between adding more pancakes.
Serve and enjoy!