In a bowl, whisk together the flour, sugar, baking powder, baking soda, and salt.
In another bowl, whisk together the milk, egg yolks, vanilla extract, and vegetable oil.
Combine the wet and dry ingredients, mixing until just combined.
In a separate bowl, beat the egg whites until stiff peaks form.
Gently fold the egg whites into the batter.
Heat a non-stick skillet over low heat and grease with a little oil.
Place ring molds on the skillet and fill them halfway with batter.
Cover the skillet and cook for about 5-7 minutes, until bubbles form on the surface.
Carefully flip the pancakes and cook for another 5-7 minutes.
Remove from the skillet and serve immediately with your favorite toppings.