Preheat the oven to 350°F (175°C).
In a small bowl, combine salt, pepper, poultry seasoning, garlic powder, onion powder, and paprika.
Season the turkey wings thoroughly with the spice blend.
In a large heavy-bottomed skillet, heat vegetable oil over medium-high heat.
Brown the turkey wings on both sides in batches, then transfer them to a 9x13 inch baking dish.
In the same skillet, sauté the onion, bell pepper, and celery until softened, approximately 5 minutes.
Add butter to the vegetables; once melted, whisk in the flour and cook for 2-3 minutes until light brown.
Gradually whisk in the turkey broth, scraping the bottom of the pan to release browned bits, and simmer until the gravy begins to thicken.
Pour the gravy and vegetables over the turkey wings in the baking dish and add thyme sprigs.
Cover the dish tightly with aluminum foil and bake for 90 minutes.
Remove the foil and continue to bake for 20 minutes until the wings are fork-tender and the skin is golden.
Rest for 5 minutes before serving over rice or mashed potatoes.