Combine first 4 ingredients; spread 2/3 cup sauce in bottom of an 8-inch square baking dish coated with cooking spray. Arrange 2 noodles over sauce; top with 1/2 cup corn and half of beans. Sprinkle with 1/2 cup cheese; top with 2/3 cup sauce. Repeat layers once; top with remaining 2 noodles. Spread remaining sauce over noodles. Sprinkle with remaining 1 cup cheese. Cover and bake at 450° for 30 minutes or until noodles are tender and sauce is bubbly. Let stand 15 minutes. Sprinkle with onions.