Start by bringing a large pot of water to a boil. Add in peeled and diced potatoes, cooking them for about 15–20 minutes until they are soft and can be easily pierced with a fork. Once done, drain the water and set the potatoes aside to cool slightly before mashing.

In a separate pot, add the cod filets and cover them with water. Bring the water to a gentle boil and cook the cod for about 10 minutes, or until it flakes easily when tested with a fork. Once cooked, drain the cod, and allow it to cool for a few minutes before flaking it into bite-sized pieces.

In a large mixing bowl, mash the cooled potatoes until smooth. Add the flaked cod, finely chopped onion, fresh parsley, dried oregano, salt, and black pepper. Mix everything together until well combined, ensuring that the cod and potatoes create a cohesive mixture.

Scoop the mixture from the bowl and shape it into patties about 1.5 inches thick. Use your hands to form round cakes that hold their shape well. Place the formed cakes on a plate lined with parchment paper.

On a clean plate, spread out some flour for coating. Dredge each fish cake in the flour, ensuring a light dusting on all sides. In a large skillet, heat vegetable oil over medium heat until shimmering. Carefully add the cakes to the hot oil, frying for about 4–5 minutes per side until they turn golden brown and crispy.

Once the crispiness is achieved, remove the fish cakes from the skillet and transfer them to a paper towel-lined plate to absorb any excess oil. Serve immediately and enjoy with your favorite side dishes or dips.