Preheat oven to 475 degrees or Grill on high heat.
par-boil potatoes for about 10 min.
Cut corn into quarters
Spray aluminum foil sheets about 12 inches long with butter flavor cooking spray.
Divide potatoes, corn, shrimp and sausage evenly onto 6-8 pieces of foil about 12 inches per sheet. Sprinkle with salt & pepper, Cajun seasoning and fresh parsley. Place a pat of butter on top of each sheet.
Fold foil over mixture and seal edges into a pouch.
Bake in a 425 degree oven for 20 minutes or grill over hot coals for 20 minutes.