In the past I have made a really great chicken stock in my pressure cooker/canner.
This was done using the following approach:
In the pressure canner I would place the following:
4lb Whole Chicken
4-5 Cups of water
1 tsp of salt
1/4 tsp of ground pepper
1/4 cup of diced carrot
1/3 cup of diced celery with leaves
1/3 cup of onion
1 tsp of thyme
1 tsp of parsley
1/4 tsp of oregano
1 garlic clove diced