Preheat salmon to 350 degrees. Place salmon on a sheet pan, skin side down and season with salt and pepper. Bake for 15-20 minutes until cooked through. Let cool. After salmon has cooled, flake with a fork into small pieces.
Add 2 tablespoons of olive oil and saute bell peppers and onions until soft about 5-7 minutes. Cool to room temperature.
Add salmon, bell peppers, onion mixture, parsley, old bay, salt, pepper, Dijon mustard, mayo, panko, egg, and lemon juice in a medium-sized bowl. Mix well. Form salmon into 3-ounce cakes. Makes 10 salmon cakes.
Heat pan over medium-high heat with 2 tablespoons olive oil and 1 tbsp. butter. Add salmon cakes and fry for 3 to 4 minutes on each side until browned. Drain on paper towels.