First peel the onions and cut them into thin slices.
Transfer them to a non-stick pan with butter, salt and pepper and let them dry.
Wet the slices of bread with milk, without sponging them too much, and place them on the bottom of a bowl.
Add some of the onions and provolone.
Continue in layers and finish with onions and parmesan, then cook for about 20 minutes or until browned in a ventilated oven preheated to 200 ° C.
The bowl of bread and onions is ready, let it rest for about ten minutes before serving.
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