Add the drained salmon to a large mixing bowl. Flake with a fork into small, ⅛-inch pieces.
Add the beaten egg, ground oats, finely chopped spinach, feta cheese, chives, Dijon mustard, lemon juice, garlic powder, salt, and pepper. Mix together with a rubber spatula or fork until the spinach is evenly distributed.
Use your hands to form four patties of equal size, about ½-inch thick. Transfer to a parchment-lined plate.
Warm the oil in a large skillet over medium heat. A nonstick skillet is helpful, but you can use stainless steel or cast iron. For any pan, just make sure the oil is hot before you add the patties. This promotes a good searing and will help prevent them from falling apart.
Put the salmon patties in the skillet. If it's going to be too crowded, cook them in batches. Cook for 3 to 4 minutes over medium heat until golden brown but still tender inside. It's easy to overcook burgers made with canned salmon. Reduce the heat if you feel they are browning too quickly.
Transfer the cooked patties to a plate lined with paper towels.
Serve on a bun with toppings of your choice. For an extra touch, brush the inside of the buns with oil or butter and toast for a couple of minutes in a skillet.
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