In a medium to large soup pot, use 1 tbsp of the oil (premeasure the 1/2 cup and just use a little from that) to saute the onion, celery and bell peppers until the onions are translucent.
Add the sausage and shrimp and saute for about 2 more minutes.
Stir in the arrowroot powder, then add the bay leaves, chicken broth remainder of oil and creole seasoning.
Bring to a boil and reduce to a simmer.
Cook for about 10-15 minutes, or until the broth has reduced enough to become slightly thickened from the arrowroot powder (it won't be very thick, but you'll see a slight difference in the broth).