Preheat the oven to 375 Fahrenheit.
In a bowl combine the shredded turkey, mixed vegetables, cream of chicken soup, chicken stock, salt, pepper, onion powder, garlic powder and paprika. Add herbs if using (thyme or sage would be great).
Set aside, taste for seasoning and adjust accordingly if necessary.
Grease your baking dish and pour the turkey filling and spread evenly on the casserole.
In a bowl combine the Red Lobster Cheddar Bay Biscuit Mix with the seasoning packet that comes in the box, add the milk and whisk together until well combined. Add cheddar cheese if using.
Pour the biscuit batter on top of the turkey filling. Do not mix.
Bake at 375F uncovered for about 30 to 45 minutes until the top is golden brown.
Let the turkey casserole rest for about 10 minutes before slicing to allow the filling to set.
Slice and enjoy immediately.