Preheat grill to 375°F or oven to 400°F.
Toss potatoes with olive oil, salt, and black pepper.
Mix melted butter, garlic, paprika, Old Bay, and red pepper flakes.
Divide shrimp, corn, and potatoes onto foil sheets.
Drizzle with garlic butter and seal packets.
Grill: Cook for 12-15 minutes.
Oven: Bake at 400°F for 15-20 minutes.
Campfire: Place on coals for 12-15 minutes.
Open carefully, garnish with parsley, and serve with lemon.