Sprinkle salmon fillets with 2 tsp olive oil, salt & pepper.
Stir together tomatoes, onion, lemon juice, oregano, thyme and a pinch of salt & pepper.
Place a salmon fillet (oil side down) on a sheet of foil. Wrap the ends of the foil in a spiral shape. Spoon the tomato mixture evenly over each fillet. Fold the foil over, sealing the packets closed.
Place packets on a heavy baking sheet. Bake until cooked through, about 25 minutes.