Start by patting your cod fillets dry with paper towels to ensure a perfect sear. Sprinkle both sides generously with kosher salt and freshly cracked pepper.

In a large skillet, heat two tablespoons of olive oil over medium-high heat until shimmering, about 2 minutes. Add the seasoned cod fillets and cook for 2 to 3 minutes on each side until golden brown and flaky.

Reduce the skillet heat to medium and add 4 tablespoons of unsalted butter to the remaining oil. Allow it to melt, then add 2 teaspoons of minced garlic and sauté for about 30 seconds until fragrant.

Stir in the juice of one freshly squeezed lemon along with its zest. Let the mixture simmer gently for about 1 minute.

Return the cooked cod to the skillet, spooning the lemon-garlic butter sauce over the fillets. Cook for an additional 2 to 3 minutes until the fish flakes easily.

Garnish with freshly chopped parsley and serve immediately for the best flavor.