Preheat the oven to 375°F (190°C).
Cook the pasta shells according to package instructions until al dente, then drain and set aside.
In a mixing bowl, combine the ricotta, mozzarella, Parmesan, Italian herbs, salt, and pepper, along with any additional toppings.
Spoon the filling into each cooked pasta shell, ensuring to pack them well but without breaking the shells.
Spread a thin layer of marinara sauce on the bottom of a baking dish and arrange the filled shells on top.
Top the stuffed shells with the remaining marinara sauce and sprinkle extra mozzarella cheese as desired.
Cover the dish with foil and bake for 25 minutes, then remove the foil and bake for an additional 10-15 minutes until the cheese is bubbly and golden.
Let cool for a few minutes before serving to allow the flavors to settle.