Lemon Garlic Butter Parmesan Cod with Spinach

This one-pan cod recipe is everything a weeknight dinner should be: fast, elegant, and deeply satisfying. Thick white fish gets a craggy Parmesan crust, then sears in foaming lemon garlic butter until golden.

Baby spinach wilts right in the same skillet, soaking up all the buttery goodness. A final shower of Parmigiano Reggiano makes it irresistibly savory.

Ready in about 25 minutes, it's the kind of dish that feels special but comes together with minimal effort and even less cleanup.

Seared in a hot cast iron skillet, the cod develops a crisp, nutty crust from the grated cheese while staying moist and flaky inside. The lemon wheels and garlic perfume the butter, which then coats the spinach as it wilts.

Every bite balances bright citrus, rich butter, and salty aged cheese. This recipe works beautifully for a quick family dinner or a casual dinner party — and it's all made in one pan, so the flavors build and the cleanup stays simple.

Ingredients

Why this recipe works

The Parmesan coating does double duty: it forms a golden, crispy crust that locks in moisture, and it creates a savory base that browns beautifully in the butter. Because the cheese is grated finely, it melts and clings to the fish, giving every bite a nutty, salty richness.

Cooking the spinach in the same pan after the fish means it picks up all the browned bits and lemon-garlic butter.

This builds layers of flavor without any extra steps. The foaming butter technique also emulsifies slightly, creating a silky sauce that coats the fish and greens.

Notes and substitutions

Choose thick, center-cut cod loins — they hold up to searing and stay juicy. If using thinner fillets, reduce the cooking time slightly. Parmigiano Reggiano is key for its crystalline texture and deep umami; avoid pre-grated cheese, which doesn't melt as smoothly.

A cast iron skillet gives the best crust and retains heat well. If you don't have one, use a heavy stainless steel pan. For a milder flavor, substitute grana padano or pecorino. Fresh lemon is essential — bottled juice won't give the same brightness.

• cod loins: halibut, haddock, or another firm white fish fillet
• Parmigiano Reggiano: grana padano or pecorino romano for a sharper flavor
• baby spinach: kale or Swiss chard (cook a few minutes longer)
• unsalted butter: salted butter and reduce the added salt

Equipment

• Box grater
• Chef's knife
• Cutting board
• Large cast iron skillet
• Fish spatula
• Measuring spoons
• Plate for dredging