Bring a large pot of water to a boil. Place the shells in the water and cook 3 minutes less than the cook time listed on the package. Drain the shells and rinse with cool water.
Spray a 9X13 pan with non-stick spray and then spread 1/2 of the marinara sauce at the bottom of the pan.
In a medium size bowl, combine the ricotta cheese, parmesan cheese, egg, minced garlic, parsley, basil leaves, salt and pepper. Stir to thoroughly combine.
Then spoon the cheese mixture into the shells and place the shells in the 9X13 pan on top of the sauce.
Pour the remaining marinara sauce on top of the shells and top with the mozzarella cheese.
Bake uncovered for 20-25 minutes until hot and the cheese is fully melted.