Preheat oven to 400 degrees F. and line a baking sheet with parchment paper.
In a large bowl, combine the egg, mayonnaise, cream cheese, grain mustard, lemon juice, old bay seasoning, and bread crumbs. Mix until well combined.
Fold in the green onions, parsley, and lump crab meat gently, cover and chill for about an hour.
Season the salmon fillets with salt and pepper and slice the salmon fillets lengthwise down the center to create space for stuffing.
Place the salmon fillets on the prepared baking sheet and stuff the salmon fillets with the crabmeat filling.
Grate some fresh parmesan cheese on top of the crab meat filling, sprinkle a little oregano and paprika, then bake for about 14-15 minutes or until fully cooked through.