Preheat the oven to 190C (375F) and line a baking sheet with parchment paper.

In a food processor, add the flour, baking powder, baking soda, salt, and sugar. Pulse to combine.

Then, add the butter and pulse until the mixture resembles a coarse meal. You can also mix all dry ingredients in a bowl and then work the butter into them using a pastry knife, fork, or by hand.

Place everything into a large mixing bowl and add the kefir. Mix with your hands or a spoon just until no dry ingredients are left and the dough has formed.

Transfer the dough onto a floured surface and dust the top with a little bit of flour. Shape it into a round loaf but don’t knead it. Then, place on a prepared baking sheet, dust with flour, and score the top with a cross using a small, sharp knife.

Bake for 30-40 minutes or until it expands and forms a golden brown exterior. The bread should sound hollow if you tap on it with your fingertips. After 20 minutes in the oven, rotate the baking sheet and loosely cover the bread with a piece of foil to prevent over-browning.

Remove onto a cooling rack to cool down and serve.