Season the turkey wings with Cajun seasoning, black pepper, salt, garlic powder and Worcestershire sauce.
In a large pan over high heat, add oil and brown turkey wings on both sides. Remove from the pot and place on a plate.
Add onion, celery, green bell pepper and carrot to the pan and cook for about 5 minutes until the vegetables have softened.
Add turkey wings back to the pot then add water, chicken bouillon, thyme and bay leaf and bring to a boil. Reduce heat to a simmer and cover pot.
Cook for about 2 hours or until the turkey is tender.
Mix cornstarch and cold water in a small bowl then add to the pot. Cook for 5 minutes then remove from heat. Garnish with freshly chopped parsley.