Prepare Salmon Patties: In a bowl, combine the salmon (with liquid), egg, and crumbled saltine crackers. Mix gently until combined. If too mushy, add a few more crackers. Form into patties.
Cook Patties: Heat canola oil in a skillet over medium heat. Fry patties 3–4 minutes per side until golden brown and cooked through. Remove and drain on paper towels.
Fry Potatoes and Onions: In a separate skillet, heat oil over medium heat. Add sliced potatoes and onions, season with salt and pepper, and cook until potatoes are golden and tender, stirring occasionally.
Cook Green Beans: Steam or boil green beans until tender. Toss with butter, salt, and pepper if desired.
Serve: Plate salmon patties with fried potatoes and onions alongside green beans. Serve hot.
Serving and Storage Tips:
