Start by cooking your fish fillets. If using fresh fish, poach or steam them until fully cooked, about 10 minutes. If using canned crab, simply drain and set aside. Once cooked, allow the fish to cool slightly, then flake it into bite-sized pieces.
In a large mixing bowl, combine the flaked fish, roasted peppers, minced garlic, sweet paprika, light mayonnaise, minced celery, Dijon mustard, lemon juice, one egg (beaten), parsley, scallions, Old Bay seasoning, kosher salt, and black pepper. Stir until well combined.
With your hands, form the mixture into small patties, about 2-3 inches in diameter. This recipe should yield about 8-10 fish cakes, depending on the size you prefer.
Place the seasoned panko in a shallow dish. Gently coat each fish cake in the panko, pressing slightly to adhere. This will create a lovely crunchy crust once cooked.
Heat a skillet over medium heat and lightly spray with olive oil. Once the oil is hot, add the fish cakes, cooking in batches if necessary. Cook for about 4-5 minutes on each side or until they’re golden brown and crispy. Make sure they’re cooked through.
Once cooked, transfer the fish cakes to a plate lined with paper towels to absorb any excess oil. Serve warm with lemon wedges and additional scallions for garnish.