Add to a bowl the mashed potatoes, cod, onion, egg, butter, and spices and mix well.
In a separate dish, add the cracker meal. Scoop uniformed balls of the potato mixture and roll them around gently in the meal. Carefully flatten the balls between the palms of your hand to form an egg shape.
Over medium flame, heat oil in a skillet to 350 degrees. Brown the coddies on both sides for 2-3 minutes. Drain on a wire rack or paper towels. Serve immediately.