Start heating your oven at 180 degrees. Place the muffin papers inside the 12 muffin mold and leave them on the edge.
In a bowl, blend flour, cocoa powder, baking soda, vanilia powder, salt and baking powder.
Put sugar, eggs, melted butter and kefir in your beating bowl. And start beating with the beater. When they mixed, add the dry mixture by sieving and whisking.
Add parted chocolates (after separating 1/4 cup of water) into the mixture and take care not to mix it too much.
Portion the mixture out to the muffin sheets to the brim and sprinkle the 1/4 cup of chocolate on them and then place them in the oven. It cooks until it comes out dry when you dip a toothpick in the middle of about 18-21 minutes.