My mother would never dream of throwing out the chicken or turkey bones. They automatically went into a stockpot after dinner was over. She would strip off all the meat that was not consumed at the meal, tuck it away, and put the bones on to simmer.
No need to precook the vegetable. Add the bones to the pot along with a couple of ribs of celery, a couple of carrots, a large onion, skins and all, a few crushed garlic cloves, also skins and all, and any other vegetable trimmings from the meal along with ample salt and pepper. Add a couple of tablespoons of Bell’s poultry seasoning, a few bay leaves, crushed, and any other seasoning you like. Usually, I’ll add fresh rosemary and thyme.
Bring to a boil, reduce to simmer, cover and simmer or three or four hours, or even overnight.
When ready, strain and put into freezer containers, leaving out what you might need this week for a soup base or addition to other savory meal.