No recipe here. I'd mix the chopped turkey with some gravy and add in some veggies (leftovers? or fresh?) and saute some onions. S+P as you said, and if you wish, additional seasonings. If there's leftover dressing, you could crumble it and add it to the mix too.
Another possibility would be to do it like a shepherds pie with a similar mix on the bottom, and mashed potatoes overtop.
Bake the same as you would a pie.
If you want a recipe to follow or to use as a guide ... Google will be glad to provide!!