In a mixing bowl, combine flour, salt, yeast and baking powder.
Add flaxseeds, milk and yoghurt and mix well. Add water and knead it into a smooth, pliable dough.
Add butter. Stretch and knead for 10 minutes.
Now, round the dough. Cover and rest it in a warm place until it doubles in volume. This can take about an hour, or sometimes more, depending on the temperature.
Once the dough has doubled, divide it into eight equal portions.
Knead them individually and round them.
Place them on a baking sheet. Cover and rest them for about 30 minutes.
Preheat the oven to 200 degrees C for 10 minutes.
Make a cut on a dough with a sharp knife or blade.
Transfer the baking tray to the oven and bake the bread rolls for 30 minutes at 200 degrees C.
Then, remove them and let them cool.