Preheat your oven to 400°F. This temperature ensures that the ingredients cook through evenly, ensuring a tender and flavorful result.

Wash the shrimp, potatoes, and corn thoroughly. Slice the sausage into bite-sized pieces. Cut the corn into halves or thirds, depending on size, for easy cooking and serving.

In a large bowl, combine shrimp, sausage, corn, and potatoes. Drizzle with olive oil and sprinkle with Old Bay seasoning, salt, and pepper. Toss to coat the ingredients evenly in the seasoning.

Lay out four large sheets of heavy-duty aluminum foil. Divide the shrimp and vegetable mixture evenly among the sheets. Fold the foil over the ingredients and seal tightly, ensuring no steam escapes during cooking.

Place the foil packets on a baking sheet and bake in the preheated oven for 25-30 minutes. The shrimp should be opaque and the potatoes fork-tender when done.

Carefully open each foil packet using tongs or oven mitts to avoid steam burns. Sprinkle with chopped parsley and serve hot, directly from the foil for an authentic shrimp boil experience.

Serve the foil packets with a side of crusty bread or a fresh green salad for a complete meal. The bread is great for soaking up the flavorful juices.

Allow leftovers to cool before transferring to an airtight container. Store in the refrigerator for up to 2 days. Reheat in the oven at 350°F until warmed through.