PREHEAT oven to 400°F. Prepare Dinner in large saucepan as directed on package.
MEANWHILE, brown meat in large skillet on medium heat; drain. Add onion; cook until crisp-tender, stirring occasionally. Add meat mixture, salsa and corn to prepared Dinner; mix lightly. Spoon into shallow baking dish; sprinkle with chips.
BAKE 15 min. or until heated through.