In a small boil, combine salt, garlic powder, onion powder, paprika, chili powder, black pepper, and Cajun powder. Set aside.
Wash the potatoes thoroughly. Slice in quarters. Boil in water until fork tender. Take out of the water to place in a bowl. Season with the seasoning mixture.
Husk and cut up the corn. Use the same water from the potatoes to boil the corn for 3 minutes. Take 'em out of the water. Place in a bowl. Season with the seasoning mixture.
Drop the andouille sausage into the already hot water(from potatoes and corn) to blanch for a couple of minutes. Take 'em out of the water. Place in a bowl. Season with the seasoning mixture.
Drop the sliced air-dried sausages into the already hot water(from potatoes and corn) to blanch for a a minute. Take 'em out of the water. Place in a bowl. (No need to season these.)
Season the thawed raw shrimp with the seasoning mixture.
Divide the fillings between the foil sheets. Fold the sides upwards then fold again plus the short sides to secure the packs. (REFER TO THE VIDEO)
Time to grill.
Grill each packet for 10-12 minutes. Use a grilling tong or spatula when picking them up so you don't burn your hands.