Preheat oven to 350F. Cook noodles till tender; drain. Saute onion, mushroom, sunflower seeds in oil till vegs soft & seeds crisp. Combine drained noodles & veggies. Stir in cheese, eggs, yogurt & seasonings. Turn into an oiled casserole, top with bread crumbs & cheese. Bake at 350F for 30 minutes or till casserole is firm. Serves:4