If your cod is frozen, make sure to defrost it overnight in the refrigerator, or let it sit in the plastic packaging in a bowl of warm water for a few minutes,
Preheat the oven to 400 degrees.
While the oven is preheating, slice up the sweet potatoes in fry-shaped pieces (you can leave the skin on—it's tastier!).
Mix together the sweet potato fries, olive oil, garlic salt, paprika, salt, and pepper in a large bowl.
Line a sheet pan with a piece of parchment paper (or a silicone baking sheet) and spread the sweet potato fries on the sheet pan.
Place in the oven and bake for 20 minutes.
A few minutes before taking out the sweet potato fries, prep the fish. Whisk the egg in a small bowl and place the breadcrumbs in another bowl.
Take a piece of cod and generously dip it in the egg, then dip it in the breadcrumbs. Make sure the breadcrumbs thoroughly coat the outside of the cod.
Make some room on the sheet pan for the pieces of fish by brushing some of the sweet potato fries to the side. Place the breadcrumbed cod fillets on the sheet pan with parchment paper.
Bake the whole sheet pan again for 10 minutes, or until the pieces of cod are officially cooked. If the fish flakes easily, it is finished.
Enjoy with a spicy brown mustard aioli (mix mayonnaise and spicy brown mustard) and a fizzy beverage of your choice!