In a separate bowl, combine baking powder with flour.
Combine sour cherries with blended oats. This will help prevent the cherries from sinking to the bottom as it bakes. Keep aside.
Beat eggs with sugar, vanilla sugar and a pinch of salt.
Blend well for 3-4 minutes on medium speed.
Add yogurt slowly and continue mixing.
Add oil slowly and continue mixing.
After about 10 minutes in total, add the dry ingredients. Slowly sift in the dry ingredients with the liquid ingredients and mix with a wooden spoon. Blend well.
Add half of the cherries into the bowl and fold in 2-3 times.
Pour batter into a greased pan.
By hand, place the remaining cherries on top. The cherries will be absorbed into the batter as it rises and bakes.
Bake 370F for 30-35 minutes. Check with a toothpick, if it comes out clean, then ready.