01 - Preheat the oven to 400°F. Line a baking tray with parchment paper or lightly grease a large baking dish.
02 - Arrange the bell peppers, red onion, cherry tomatoes, and garlic evenly on the tray. Drizzle with 1 tbsp olive oil, season with salt and pepper, and toss to coat.
03 - Place the cod fillets on top of the vegetables. Drizzle the remaining olive oil over the fish. Sprinkle with thyme, oregano, and half the parsley.
04 - Top each fillet with lemon slices. Season lightly with salt and pepper.
05 - Bake in the preheated oven for 18–20 minutes, or until the cod is opaque and flakes easily with a fork and the vegetables are tender.
06 - Remove from the oven, sprinkle with the remaining parsley, and serve immediately.