Preheat the oven to 350°F (175°C).
Carefully hollow out each of the bread rolls, keeping the tops intact. Leave a thin layer of bread on the bottom and sides to hold the filling. Set the tops aside for later.
In a large mixing bowl, combine the chopped shrimp, crab meat, cream cheese, mayonnaise, shredded mozzarella, parsley, lemon juice, garlic powder, black pepper, and salt. Mix until all ingredients are well combined.
Spoon the seafood mixture into each hollowed-out bread roll generously. If desired, sprinkle extra mozzarella cheese on top of each filled bread bowl.
Place the filled bread bowls on a baking sheet and cover them with aluminum foil to prevent over-browning.
Bake in the preheated oven for 15 minutes, then remove the foil and bake for an additional 10 minutes, or until the tops are golden and the filling is heated through.
Remove from the oven and let cool for a few minutes before serving. Replace the tops on the bread bowls, if desired.