Preheat oven to 450 degrees F or grill to medium-high.
Center one-half of steak cubes on each sheet of Reynolds Wrap® Non-Stick Foil with non-stick (dull) side toward food; sprinkle with 1/2 teaspoon Sante Fe seasoning. Arrange zucchini, red pepper and corn on top of steak.
Combine gravy, remaining seasoning and salt; drizzle over beef and vegetables.
Bring up foil sides. Double fold top and ends to seal packet, leaving room for heat circulation inside. Repeat to make two packets.