01 - Preheat your oven to 400°F. Line a baking sheet with parchment paper.
02 - In a large bowl, toss the carrots, bell pepper, zucchini, and red onion with 1 tbsp olive oil, 1/2 tsp salt, and 1/4 tsp black pepper. Spread the vegetables evenly on one side of the prepared baking sheet.
03 - Pat the cod fillets dry with paper towels. Place them on the other side of the baking sheet.
04 - In a small bowl, mix 2 tbsp olive oil, lemon zest, lemon juice, parsley, dill, 1/2 tsp salt, and 1/4 tsp pepper. Brush this mixture evenly over the cod fillets.
05 - Bake for 18–20 minutes, or until the cod is opaque and flakes easily with a fork, and the vegetables are tender and slightly caramelized.
06 - Serve the baked cod with the roasted vegetables and garnish with extra fresh herbs if desired.