Put the filling inside the sandwich. You need to spread it so that there is as little space as possible between the bread and the “frame”, so that the egg does not leak out much later. We break the egg on top, trying to keep the whole yolk, with a little kiss, even if a little protein leaks out, there’s nothing to worry about. Place in a preheated 180 degree oven for 10 minutes, then sprinkle with crumbs or grated cheese and place in the oven for 5 minutes. Focus on your oven.