In a heavy pot, melt butter over medium heat, add carrots, celery and onions. Cook until vegetables soften, and onions become translucent. Add garlic and cook another minute.
Add chicken stock, wild rice, sweet potato, mushrooms, bay leaf, pepper and poultry seasoning. Stir to combine and continue to cook over low-medium heat. Stirring occasionally for 30-40 minutes.
One rice is cooked, add turkey and Greek yogurt stir to incorporate and continue to cook until heated through.