In the bowl with the yolks, add milk, sifted flour, baking powder, and vanilla extract. Mix until smooth.
In the bowl with the egg whites, beat until foamy. Gradually add sugar and continue to beat until stiff peaks form.
Gently fold the egg whites into the yolk mixture in three parts, being careful not to deflate the batter.
Heat a non-stick frying pan over low heat and lightly grease with vegetable oil. Place ring molds in the pan and fill each mold halfway with batter.
Cover the pan with a lid and cook for about 4-5 minutes, until the bottoms are golden brown. Carefully flip the pancakes and cook for another 4-5 minutes.
Remove the pancakes from the molds and serve immediately with your favorite toppings.