Preheat your oven to 400°F (200°C) and line a baking dish with parchment paper for easy cleanup.
In a small bowl, whisk together the olive oil, fresh lemon juice, lemon zest, minced garlic, chopped dill, dried thyme, salt, and pepper until well combined.
Place the cod fillets in the prepared baking dish, skin-side down if applicable. Pour the lemon-dill mixture evenly over the fillets, ensuring they are well coated.
Bake in the preheated oven for about 15-20 minutes, or until the cod is cooked through and flakes easily with a fork.
Remove the dish from the oven and let it rest for a couple of minutes.
Garnish with fresh lemon slices and dill sprigs before serving.