In a medium bowl, combine the zucchini, bell pepper, red onion, and cherry tomatoes. Drizzle with 1 tablespoon of olive oil, sprinkle with oregano, salt, and pepper, and toss to coat.
Divide the vegetable mixture evenly between the two foil sheets, creating a bed for the salmon.
Pat the salmon fillets dry. Rub each fillet with the remaining olive oil, minced garlic, salt, and pepper.
Place one salmon fillet on top of the vegetables on each foil sheet. Squeeze a bit of lemon juice over each fillet and top with a couple of lemon slices.
Fold the foil over the salmon and vegetables to create a sealed packet. Crimp the edges tightly to seal.
Place the packets on a baking sheet and bake for 15-20 minutes, or until the salmon is cooked through and flakes easily.
Carefully open the packets, as steam will be released. Serve immediately.
Notes
This is a complete meal, but can be served with a side of green salad if desired.
Ensure the foil packets are well-sealed to trap the steam, which helps cook the fish and vegetables perfectly.