Preheat the oven to 350 degrees F / 180 degrees C.
Wash and pat the wings dry with paper towels.
In a large mixing bowl, combine the olive oil and spices into a paste and pour over the turkey wings. Mix to coat the wings with seasoning and place them on a baking tray.
Top the turkey wings with slices of onion and bell pepper and cover with foil.
Cook turkey wings for 90 minutes.
Remove the wings from the oven and reserve the pan drippings to make the gravy.
To make the gravy, heat oil and butter in a skillet, add sliced onion, and sauté for about 7 minutes or until the onions are tender.
Stir in the minced garlic and creole seasoning and cook until fragrant for 1 minute.
Add in the cornstarch, stir continuously while cooking for 2-3 minutes and it changes to a rich toffee color.
Next, stir in about a third of the pan drippings and add the chicken broth. Scrape the bottom of the skillet so the cornstarch and brown bits get combined into the liquid.
Reduce the heat and simmer the gravy for about 3-4 minutes until it begins to thicken. (note that it will thicken more when in the oven).
Taste and adjust seasonings as needed, then pour the gravy over the turkey wings.
Bake smothered turkey wings uncovered for 30-35 more minutes, or until the wings have reached an internal temperature of 165 degrees F / 74 degrees C.