Portabello Mushroom Turkey Burgers from PonoHawaii 1 cup Portabello Mushrooms and white onions grated in small bits 2 egg whites 1 lb ground turkey breast 1/2 cup chicken broth fresh black pepper any other spices you like... Mix all ingredients, let sit for 15 minutes. Make small patties. Cook for 5 minutes. Makes 12 patties.