Broccoli Casserole

2 eggs, lightly beaten
1 can (10-3/4 ounces) condensed cream of mushroom soup, undiluted
1 medium onion, chopped
1 cup (4 ounces) shredded cheddar cheese
1 cup (4 ounces) shredded Swiss cheese
1/2 cup mayonnaise
2 tablespoons butter, melted
1 package (16 ounces) frozen broccoli cuts, thawed
1 package (10 ounces) frozen chopped broccoli, thawed
1/4 cup dry bread crumbs

In a large bowl, combine the first seven ingredients; fold in broccoli. Transfer to a greased 1-1/2-qt. baking dish. Sprinkle with bread crumbs. Cover and bake at 400° for 30-35 minutes or until heated through. Makes 8 servings.