Start by placing the cooked or canned salmon in a large bowl and flaking it with a fork. Make sure there are no large chunks so the patties hold together well. Add breadcrumbs, onion, garlic, herbs, and feta cheese, then mix gently.
Crack the egg into the mixture and pour in lemon juice along with zest. Sprinkle oregano, salt, and pepper, then stir everything until well combined. The mixture should be moist but firm enough to shape into patties.
Take small portions of the mixture and form them into round, flat patties using your hands. Keep them uniform in size so they cook evenly. If the mixture feels too soft, refrigerate it for 10–15 minutes before shaping.
Heat olive oil in a skillet over medium heat. Place the patties in the pan and cook for about 4–5 minutes on each side. Flip carefully once they develop a golden crust to avoid breaking.
Once cooked, transfer the patties to a plate lined with paper towels. Let them rest for a couple of minutes to absorb excess oil. This helps maintain their crisp exterior while keeping the inside tender.