Preheat the oven to 400°F.

Pat the cod fillets dry with paper towels and check for any remaining bones. Remove bones if needed.

Place the cod fillets in a single layer in a small baking dish. Season both sides with salt and black pepper.

In a small saucepan over low heat melt the butter.

Add the minced garlic to the melted butter and cook for 1 minute, stirring, until fragrant but not browned.

Remove the saucepan from the heat and stir in the lemon juice until the butter mixture is smooth.

Pour the hot garlic butter evenly over the cod fillets, making sure the garlic is distributed over the tops.

Transfer the baking dish to the oven and bake for 15 to 18 minutes, until the fish is opaque, flakes easily with a fork, and the top is lightly golden.

Remove the dish from the oven and let the fish rest for 2 minutes.

Sprinkle the baked cod with chopped parsley, garnish with lemon slices, and serve immediately with the pan juices.