I'm going to try and do a hamburger casserole. Is it better to brown the meat with onions (or onions and peppers), or brown the meat by itself and put the freshly cut onions in the casserole dish and bake? Will browning onions first and then baking overcook the onions? This question could apply to other vegetables such as green peppers and celery.
Well, you saute onions and celery before putting them in stuffing and then cook them again for 4 hours inside the turkey with no ill effects. I generally cook my meat and onions together because it imparts a better flavor into the meat. I have never worried about the onions being over cooked, they always end up tasting just fine in my hamburger pie and my turkey stuffing.