In a large mixing bowl, combine the flaked salmon, breadcrumbs, mayonnaise, green onions, beaten egg, Dijon mustard, lemon juice, Old Bay seasoning, garlic powder, and black pepper. Mix until well combined.
Shape the mixture into patties, about 2 to 3 inches in diameter. You should have approximately 8 patties.
Heat the vegetable oil in a large skillet over medium heat. Once hot, carefully add the salmon patties to the skillet, cooking in batches if necessary to avoid overcrowding.
Fry the patties for about 4-5 minutes on each side, or until golden brown and crispy. Remove from the skillet and place on a paper towel-lined plate to drain excess oil.
Serve warm with a squeeze of fresh lemon juice or your favorite dipping sauce.