In a large bowl, combine the sausages, potatoes, peppers, and onions. Drizzle with the oil and douse with the seasoning mix. Stir well to combine.
Lay out six 12-inch pieces of heavy duty aluminum foil. Divide the mixture among the six pieces. Fold up facing sides to meet in the middle and then crimp together. Crimp each side closed.
Cook the packets over a hot grill for 25-30 minutes or until the potatoes are tender. Alternatively, you can make them in a 375 degree oven. Serve hot.