Saute the zucchini and onion in two tablespoons of butter or margarine for about ten minutes.
Mix together the zucchini, onion, bread crumbs, cheese, salt and pepper to taste and the eggs.
Melt butter or margarine in a large frypan.
Pour in the zucchini and egg mixture and cook without stirring until the bottom is set.
Put frypan under hot broiler to cook the top.