How to make a sponge omelet step by step

• In one bowl, place the egg yolk, milk, flour, and vanilla sugar.
  25 g wheat flour, 40 ml milk, 1 teaspoon vanilla sugar, 1 egg yolk
• In the second bowl, whisk the egg white until fluffy.
  1 egg white
• Mix the ingredients from the second bowl.
• Add the egg white to the batter and gently mix.
• Grease the baking dish with butter, pour in the batter.
  butter
• Bake at 200 degrees (top-bottom mode) for about 20 minutes - until a dry stick comes out.
• Eat warm.
• If you are frying the omelet, grease a non-stick pan with a little oil.
• Pour in the batter, cover the pan with a lid, and reduce the heat.
• Fry for about 5 minutes, then carefully flip the omelet to the other side and fry until set.