Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Rinse and drain the chickpeas, then pat them dry with a clean kitchen towel to ensure they get crispy.
Trim the woody ends off the asparagus and slice the cherry tomatoes in half.
Place the chickpeas, asparagus, and cherry tomatoes on the sheet pan, drizzle with half of the olive oil, and sprinkle with half of the salt, pepper, and oregano.
Mince the garlic and whisk it together with the remaining olive oil and lemon juice in a small bowl.
Pat the cod fillet dry and place it in the center of the sheet pan, moving the vegetables to the sides.
Brush the lemon-garlic mixture over the cod and season with the remaining salt, pepper, and oregano.
Bake for 12-15 minutes, or until the cod is opaque and flakes easily with a fork and the vegetables are tender.
Serve immediately, drizzling any remaining pan juices over the fish for extra flavor.