Step 1

Preheat oven to 400°F and line a baking sheet with parchment paper (or with greased foil). Place the cod fillets on the parchment (if there is skin, place them skin-side down).

Step 2

Season the cod lightly with salt and pepper.

Step 3

In a small bowl, stir together the mayo and mustard. Spread the mixture in an even layer on top of the cod fillets.

Step 4

To the same bowl, add the butter and microwave for 30 seconds until the butter is melted. Stir in the olive oil and breadcrumbs and stir to combine.

Step 5

Zest the lemon and add the zest to the breadcrumbs. Season with the salt and pepper and stir to combine.

Step 6

Gently pat the breadcrumb mixture into the mayo-mustard layer on top of the fish.

Step 7

Bake the fish for 10-12 minutes or until the flesh is opaque and flakes easily with a fork and the breadcrumbs are golden brown and toasty.

Step 8

Serve hot and garnished with a fresh squeeze of lemon juice and some lemon slices on the side. We love this fish with a simple green vegetable on the side, such as broccoli, green beans, or even a light side salad.