Sauté the onion and celery in the oil, add chicken stock, sweet potato, red bell pepper, bay leaves and thyme.
Bring to a boil and simmer until the potatoes are tender.
Add the salmon and simmer until cooked through.
Add a bit of water to the cornstarch and thicken.
Adjust salt and pepper to taste.
Notes
For a richer stew use, 2 cups of chicken stock to simmer the vegetables and use half and half or heavy cream as the remainder of the liquid, adding it after the potatoes are cooked.