Whip up tasty salmon cakes using a food processor. Start by pulsing fresh salmon fillets in the food processor until finely chopped. Transfer the chopped salmon to a mixing bowl and add breadcrumbs, minced onions, chopped bell peppers, mayonnaise, Dijon mustard, and an egg. Season with salt, pepper, and Old Bay seasoning. Mix everything together and form the mixture into patties. Cook the salmon cakes on a skillet until golden brown on both sides. Serve with a side salad or tartar sauce.