This Turkey Tetrazzini uses up leftover turkey in a creamy, cheesy noodle casserole loaded up with tender turkey, sweet peas, and fresh mushrooms, and topped with a golden, crispy Panko-Parmesan topping.
2. In a large saucepan, melt butter over medium heat. Add onions, mushrooms, and garlic. Sauté until tender, about 5 minutes. When vegetables are tender, stir in flour and allow to heat up, about 1 minute.