In a large nonstick skillet, cook the turkey, mushrooms and onion over medium heat until turkey is cooked through; drain. Add garlic; cook for another minute. Stir in wine.
In a bowl, whisk together cornstarch and stock until smooth. Add to pan. Stir in the Worcestershire sauce, steak seasoning and thyme. Bring to a boil; cook and stir for 2 minutes or until thickened. Reduce heat. Stir in cream; heat through.