In a medium size bowl mix the flour, yoghurt, salt and nigella seeds (if using) until well combined and soft.
Cover the mixture and let it stand for 30 minutes.
Divide the dough into 6 medium-sized or 12 smaller balls.
Heat your pan to medium-high heat and spray with cooking oil.
Roll the dough on a floured surface into 6 large 15 cm circles or 12 small 11 cm circles.
Bake each side for 2 to 3 minutes on medium heat, spraying the surface of the pan slightly with cooking spray after every turn.
Cover the flatbreads with a cotton towel to prevent them from drying out.
Serve them immediately after baking or freeze them up to 2 months after they cooled down completely.