Preheat the oven to 450 degrees F.
Lay each fillet out on its own piece of foil. The foil should be a few inches longer than the fillet. Drizzle each fillet with the olive oil.
Combine the garlic, tomatoes, shallots, thyme and some salt and pepper in a small bowl. Top each fillet with the tomato mixture. Fold over the fillet and roll up the edges to create a seal. Place on a baking sheet and bake for 15 to 20 minutes. Serve removed from the foil with veggies on the top and any sauce drizzled over the fish.