In a small bowl, combine 1/4 cup of cornflake crumbs and 1/3 cup bread crumbs.
Drizzle with 2 tablespoons butter and toss to coat; set aside. In a large bowl, combine the corn, broccoli, eggs, onion, salt, pepper and the remaining cornflakes, bread crumbs and butter.
Transfer to a greased 1-1/2-qt. baking dish.
Sprinkle with reserved crumb mixture.
Bake, uncovered, at 350° for 45 minutes or until a thermometer reads 160°.