Preheat grill to 375°F or oven to 400°F.
Season tilapia fillets with salt, pepper, oregano, thyme, and paprika.
Place each fillet on a foil sheet and drizzle with olive oil.
Top with garlic, lemon slices, and optional vegetables.
Seal the foil packets tightly.
Campfire: Cook on hot coals for 10-12 minutes.
Grill: Cook over medium heat for 10-12 minutes.
Oven: Bake at 400°F for 12-15 minutes.
Open carefully, garnish with parsley, and serve.