In a large pot of salted boiling water, cook the jumbo shells according to package instructions until al dente. Drain and set aside to cool slightly.
In a large mixing bowl, combine the cottage cheese, ricotta cheese, 1/2 cup mozzarella cheese, Parmesan cheese, the beaten egg, Italian seasoning, salt, and pepper. Mix until well blended.
Using a spoon, carefully fill each cooked shell with approximately 2 tablespoons of the cheese mixture. Place the stuffed shells in a greased 9x13 inch baking dish.
Pour the marinara sauce evenly over the stuffed shells, covering them completely.
Sprinkle the remaining 1/2 cup of mozzarella cheese on top of the sauce.
Cover the baking dish with aluminum foil and bake in the preheated oven for 25 minutes. Then, remove the foil and bake for an additional 10-15 minutes, or until the cheese is bubbly and golden.
Remove from the oven and let it cool for a few minutes. Garnish with fresh basil leaves before serving.
Notes
Serve the stuffed shells with a sprinkle of fresh basil and a drizzle of olive oil for a vibrant finish.