Lay out four 12x12 squares of heavy duty aluminum foil (or if using regular foil, use two layers).
Add the sausage, corn, pepper, onion, and zucchini to a large mixing bowl. In a smaller bowl, stir together the olive oil, Italian seasoning, garlic powder, salt and pepper. Drizzle the mixture over the bowl of meat and veggies and toss well until everything is coated. Divide everything evenly between the four sheets of foil, placing the meat and veggies in the center of each piece of foil. Bring the sides of the foil up and fold them over tightly, ensuring that each sheet forms an enclosed packet over the food.
If using a grill: preheat grill to medium. Place the packets onto the grill, close the lid, and cook 15-20 minutes (or until the vegetables are tender crisp), turning over once halfway through cooking.
If using an oven: preheat oven to 400 degrees. Place the packets into the oven and bake 25-30 minutes until the vegetables are tender crisp.
The foil packets will be very hot; take caution when opening and releasing the steam.