Begin by ensuring your salmon filet is deboned and skinless. Cut it into chunks and place it in a large mixing bowl. Use a fork to break it up into smaller pieces.
In a skillet, heat 1 tablespoon of olive oil and 1 tablespoon of unsalted butter over medium heat. Add the finely diced onion and diced red bell pepper, cooking until they are softened and fragrant, about 5 minutes. Remove from the heat and let cool slightly.
To the bowl with salmon, add the sautéed vegetables, Panko breadcrumbs, slightly beaten eggs, mayo, Worcestershire sauce, sriracha, Old Bay seasoning, and season with kosher salt and black pepper to taste. Mix gently until all ingredients are well combined.
Using your hands, form the mixture into small patties, about 2-3 inches in diameter. Place them on a plate or cutting board.
In the same skillet, add the remaining olive oil and butter over medium heat. Once hot, carefully add the salmon patties, cooking for about 4-5 minutes on each side or until golden brown and crispy. Be careful not to overcrowd the pan; cook in batches if necessary.
Remove the patties from the skillet and place them on a paper towel-lined plate to absorb excess oil. Serve warm with your favorite dipping sauce or on a bun as a delicious salmon burger.