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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).
Season the cod lightly with salt and pepper.
In a small bowl, stir together the mayo and mustard. Spread the mixture in an even layer on top of the cod fillets.
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.
Zest the lemon and add the zest to the breadcrumbs. Season with the salt and pepper and stir to combine.
Gently pat the breadcrumb mixture into the mayo-mustard layer on top of the fish.
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.
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.