In a large pot or Dutch oven, combine the smoked turkey wings and chicken broth. Bring to a boil, then reduce heat and simmer for 1 hour. Remove turkey wings, shred meat, and discard bones. Return shredded turkey to the pot.
In a separate skillet, heat vegetable oil over medium heat. Whisk in the flour to create a roux. Cook, stirring constantly, until the roux is a dark brown color, about 10-15 minutes. Be careful not to burn it.
Gradually whisk the roux into the pot with the turkey and broth. Add the sliced smoked sausage, chopped onion, chopped bell pepper, and minced garlic. Bring to a simmer.
Stir in the chopped collard greens. Add cayenne pepper, salt, and black pepper. Cover and simmer for at least 30 minutes, or until greens are tender.
Taste and adjust seasonings as needed. Serve hot over rice.
Notes
This Gumbo Greens recipe is best served with a side of white rice to soak up all the delicious flavors.