Preheat the oven to 350℉
Mix together the salt, brown sugar, garlic powder, smoked paprika, black pepper, and chili powder.
Pat the turkey wings dry if needed, then season them generously on all sides. No oil is needed. Save any seasoning that remains.
Place the turkey wings in a 9×13-inch baking dish. Arrange the sliced onion and green bell pepper around the wings, then sprinkle any remaining seasoning over the vegetables.
Pour in about 2 cups of chicken broth, keeping the liquid below the tops of the wings so the seasoning is not washed away.
Cover the baking dish tightly and bake for about 2 hours.
Check the wings with a fork. If the meat slides easily away from the bone, they are ready to uncover. If not, cover again and bake for another 30–40 minutes, then check again.
Once the wings are fall-off-the-bone tender, uncover and bake for another 30–60 minutes, or until the tops are browned to your liking.
Remove from the oven, let cool slightly, and serve with some of the seasoned pan juices spooned over the wings.