Using a large bowl add the flour through a sieve and combine it with the salt, sugar and yeast.
In the meantime, in a medium pot on low heat warm the milk until lukewarm. While reserving about 25 grs of the Straggato 2% low fat Yoghurt add the rest to the milk and mix to combine.
In a small saucepan on low heat melt the butter and add it to the milk/yoghurt mixture, mix well.
Go back to the flour mixture, create a small well in the middle and slowly pour the milk/yoghurt/butter. Mix well and knead for 10 minutes. Place the dough in a metallic bowl and keep in a warm place for 1 hour covered with a damp cloth.
An hour later divide the dough to 8 equal parts and roll each part into a ball. While the surface is dusted lightly with flour, roll each ball to stretch into teardrop shapes and spread the remaining yoghurt all over them.
In the meantime, preheat the grill in the oven to 200 degrees C. When temperature is reached, add for 10 minutes a cast iron plate to the second most high rack. Carefully take the flatbreads and add them on the cast iron plate. Bake until the flatbreads crust and turn golden browned, about 3 minutes. Careful us they can burn easily.