Mince the onion and microwave it in a heatproof container covered with plastic wrap for 1 minute at 600W. Let it cool. Roll the pizza cheese into 6 small balls.

In a bowl, soak the breadcrumbs in yogurt, then add the remaining meat mixture ingredients. Mix until sticky. Divide into 6 portions, shape into patties, and insert a cheese ball into the center of each, sealing it completely.

Coat each patty in flour, then beaten egg, and finally breadcrumbs.