Cook the chicken with the onion, seasonings and bouquet garni. Then mince it together with the onion.
Blend the minced chicken into the béchamel. Set it aside to cool, then form this mixture into small cylindrical shaped croquettes. Dip them into the beaten egg and roll in the crumbs.
Heat the butter and oil in a frying pan and fry the croquettes, rolling them over, until they a