Preheat oven to Broil. Have Marinara sauce ready and warm.
Slice submarine rolls in half and place the bottom halves on a baking sheet.
Flash chicken strips in the oven for a few minutes to warm them through. Meanwhile, spoon a generous amount of Marinara sauce onto the bottom of the rolls and sprinkle evenly with grated Parmesan.
Remove chicken from oven and place hot chicken strips on top of the marinara-coated rolls.
Top chicken strips with sliced Mozzarella cheese and place the baking sheet under the broiler. Broil sandwiches just until the cheese melts.
Remove from oven and let cool for a few minutes, meanwhile, warm the tops of the submarine buns.
Distribute fresh basil leaves evenly on top of the melted mozzarella and cover them with the tops of the buns.
Using a sharp serrated knife, slice the sandwiches diagonally into three or four pieces and serve at once with a stack of napkins.