1. Preheat oven to 350°F. Grease 4-quart casserole. Cook beef in 10-inch nonstick skillet over medium heat 5 minutes, stirring occasionally, until brown; drain. Cook and drain pasta as directed on package.
2. Return pasta to pan, stir in beef, corn, salsa, and beans. Spoon half of the pasta mixture into casserole. Sprinkle with 2/3 cup of the cheese. Spoon the remaining pasta mixture into casserole. Place tomato slices on top. Sprinkle with remaining cheese.
3. Cover and bake 35-40 minutes or until hot and cheese is melted.