Drain salmon; add to a large bowl. Add mashed potatoes, egg, seasoning, and mustard. Mix until well blended. Form into four patties.
Heat oil in a non-stick fry pan over medium-high heat. Add patties; cook, flipping halfway, until golden brown on both sides, about 8 min.
Meanwhile, slice tomato. Slice onion into rings.
Place patty on bottom bun; top with tomatoes, onion, and lettuce, then cover with top bun.
Per serving: Calories 400, Fat 15 g (Saturated 3 g, Trans 0 g), Cholesterol 110 mg, Sodium 480 mg, Carbohydrate 35 g (Fiber 2 g, Sugars 4 g), Protein 30 g.
Quickly and easily make mashed potatoes for this recipe in the Rectangular Steamer. Peel and cube 1 potato such as Russet or Yukon Gold. Cover; microwave on high 5 min, until tender. Using Ground Meat Separator or a fork, mash the potato. Measure 1⁄2 cup, save remainder for use at a later date.
The bones in canned salmon are a great source of calcium! They’re soft enough to mash up with the fish.