Pre heat the oven to 180ºC.
Get ready a baking tray and oil it.
In a bowl mix the flours, baking powder and salt. Mix well. Add the yoghurt and mix with a fork or spatula until well incorporated. The dough must look like breadcrumbs.
In a clean surface, add a bit of flour, take the dough and mix it around 15 times, until it’s not sticky any more.
Divide into 4 equal parts. Make little balls and make a whole in the middle with your finger.
Put the on the baking tray. Grab the beaten egg and with a brush, brush the dough on the surface and add the desired toppings.
Put it in the oven for 25 minutes. Let cool for at least another 15 minutes before cutting them.