You can use leftover mashed or sweet potatoes. Reheat 2 to 2-1/2 cups leftover mashed regular sweet potatoes in a microwave safe bowl. Cover and micro-cook on 70 percent power for 1-1/2 to 2 minutes, stirring once. Use 2 cups chopped, cooked turkey for the ground turkey. Cook onion in 1 tablespoon cooking oil until tender, but not brown. Add vegetables and cook as directed. Add cooked leftover turkey with the tomato sauce; continue as directed.