Transform Ordinary Ingredients into Delicious Blueberry Cake!

Ingredients:

3 Eggs, separated
200g Sugar (100g for egg whites, 100g for egg yolks)
10g Vanilla Sugar
200g Flour
10g Baking Powder
200g Yogurt
80g Vegetable Oil
250g American Blueberries
Butter for greasing the pan
Sliced Butter cubes (quantity as needed for the pan)
Additional Sugar for sprinkling