Parmesan Crusted Cod with Lemon Garlic Butter in One Skillet

A crisp Parmesan and panko crust, a flaky piece of white fish, and a pan of lemon garlic butter that soaks into the spinach beneath. This cod skillet is built around one pan and one clear sequence, so the fish stays juicy and the crust stays golden. Dinner comes together in about thirty minutes with very little cleanup.

This is a weeknight fish dinner that feels like a restaurant plate. Thick white cod is coated in a mix of finely grated Parmesan and panko, then laid over a bed of fresh spinach in a pool of melted butter scented with garlic and lemon.

The skillet goes from the stovetop to the table, so you spend less time washing up and more time eating while the crust is still crackling.

Every component has a clear job: the cheese and crumbs build the crust, the butter carries the flavor, and the spinach soaks up the sauce as it wilts under the fish. Read through the steps once before you start, because the crust and the pan sauce both move quickly once the fish goes in.

Ingredients

Why this recipe works

The crust works because the Parmesan and panko are applied to dry fish. Patting the cod dry removes surface moisture, so the coating adheres and browns instead of steaming. Grated Parmesan melts into a savory, lacy crust that gets crisp in the hot butter, while the panko adds crunch that stays firm even as the fish cooks beneath it.

Cooking the fish directly over the spinach and garlic butter creates a built-in sauce. As the butter foams around the fillets, its fat and lemon juice carry flavor into the greens and into the crust's edges. The spinach wilts in the sauce rather than being cooked separately, so the whole dish finishes in one pan and every bite combines fish, greens and butter.

Notes and substitutions

Choose cod fillets of similar thickness so they cook evenly. A thick center cut is ideal because it stays moist and flakes into large pieces. If your fillets are very thin, reduce the cooking time and check the flesh earlier.

Buy the Parmesan as a block and grate it yourself on a box grater; pre-grated cheese is drier and does not melt as smoothly into the crust. Use unsalted butter so you control the saltiness of the sauce, and add salt to the fish before coating it.

A 12-inch black cast iron skillet holds the four fillets with room between them and keeps the heat steady for a good sear. A nonstick skillet works too, but it will not brown the crust as deeply.

You need a box grater, a shallow dish for the coating, a pair of metal tongs for flipping, and paper towels for drying the fish. Fresh spinach is the traditional green here, and it wilts in just a minute or two. Panko gives the lightest crunch, but plain dry breadcrumbs make a good substitute.

• Panko breadcrumbs: Plain dry breadcrumbs, or crushed unsalted crackers for a finer crust
• Unsalted butter: Salted butter, with less added salt
• Fresh spinach: Baby kale or chard, cooked a little longer until tender

Equipment

• Black cast iron skillet, 12-inch
• Box grater
• Wooden cutting board
• Metal tongs
• Shallow dish for the coating
• Paper towels