Add the bread to the food process, process it until fine crumbs. Reserve.
Stick the cloves in both onions, then add to a pot along with the milk, the bay leaf, the peppercorns and the nutritional yeast. Turn on the heat and bring it to almost a boil, then turn off the heat, cover the pot and leet it marinate for at least 2 hours, or overnight in your fridge.
Before serving, add breadcrumbs, the cream and reheat the sauce. Remove the onions and squeeze them between two plates to retain most of the onions and cloves juices.
Serve it hot.