Activate the Yeast: Add water, milk, yeast, and sugar in the mixing bowl of the Thermomix and mix for 3 min/37C/speed 2.
Make the Dough: Combine baking powder and salt with flour and knead for 4 min/dough button.
First Rise: Place the dough in a lightly oiled bowl, cover and let rise for 1 hour, or until doubled in size.
Divide the Dough: Transfer the dough to a lightly floured surface and divide it into 4 equal pieces. Shape each into a smooth ball. Place them on a parchment-lined baking sheet dusted lightly with flour. Cover and let rest for 30 minutes.
Preheat the Oven: Preheat the oven to 480F.
Prepare the Egg Wash: Whisk together the egg yolk and yogurt until smooth. Brush each dough ball generously.
Shape the Flatbreads: Using your fingertips over the surface to create the traditional dimples. Sprinkle generously with sesame or nigella seeds.
Bake: Bake for 10 minutes, or until beautifully golden brown. Allow to cool for a few minutes before serving.
