Mix the oats and kefir. Soak for about 30 minutes.
Cut the dried apricots into small pieces. Soak the apricots in the orange juice for about 15 minute and drain well.
Mix the flour and baking powder. Beat the butter, sugar and egg until fluffy. Add the flour mixture, pistachios, 1 pinch of cinnamon and the apricots. Fold in the oat mixture. If the batter is too runny, add more flour.
Grease the wells of a muffin tin with butter or line with paper cups. Pour in the batter. Bake for about 20 minutes at 180°C (approximately 350°F). Remove from the oven, let cool and serve.