Begin by preheating your oven to 400 °F (about 200 °C). Lightly oil your baking dish. Use your sharp knife to create a deep pocket in each salmon fillet—not cutting through completely—so you can stuff without breaking. Season the exterior of the salmon fillets with olive oil, lemon juice, salt, pepper, paprika, and garlic powder.
In a bowl, combine softened cream cheese, mayonnaise, Parmesan cheese, Dijon mustard, Old Bay seasoning, lemon zest, parsley, green onions, and (if using) hot sauce. Mix until smooth and creamy, then gently fold in the drained crab meat, chopped shrimp, and panko breadcrumbs. Be careful not to over-mix; you want the textures of shrimp and crab to stay somewhat distinct.
Spoon the seafood filling into the pockets you made in each salmon fillet, distributing it evenly. Place the stuffed salmon into your prepared baking dish. Bake in the preheated oven for about 15-18 minutes, or until the salmon is opaque throughout and flakes easily with a fork. Once done, garnish with fresh parsley and serve with lemon wedges.