Sift flour into a bowl, add baking powder, salt and pepper. Butter cut into small pieces; grind with flour until the mixture resembles breadcrumbs. Wash, dry and finely chop the onion. Cheese grate on a coarse grater. Add onion and cheese to batter.
Pour in kefir, mix thoroughly.
Preheat the oven to 200 C. Grease a baking sheet with vegetable oil. Put on a baking sheet 1 tbsp. l. test at a distance of 5 cm from each other. Put in the oven and bake for 15 minutes.