Melt butter in pan over med low heat, add onion and saute til soft, add 3 tblspn of the gravy and the waterand 1/4 tsp of poultry seasoning and simmer.
Break bread up into pieces and mix rest of poultry seasoning, add 1/4 of chicken breading mix. Mix the turkey in the bread add the onion mixture and mix together.
In a med size bowl add bread crumbs, chicken breading mix and crushed crackers. Use an ice cream scoop and scoop a ball of turkey croquette mix and roll until ball is covered. Take the croquettes and refrigerate 1/2 hr. (I like to put mine in the freezer for an hour or so)
Preheat oven to 350, bake on a greased cookie sheet for 30 minutes until golden and crispy. Heat the rest of gravy to serve with the croquettes.