01 -
Bring a large pot of salted water to a boil. Add jumbo pasta shells and cook until al dente, about 8 to 10 minutes. Drain and set aside to cool slightly.
02 -
In a large mixing bowl, blend ricotta cheese, 1/2 cup shredded mozzarella, grated Parmesan cheese, and egg until smooth. Heat olive oil in a skillet over medium heat, add minced garlic, and cook for 30 seconds until fragrant. Add spinach and cook until wilted, about 2 to 3 minutes. Allow spinach mixture to cool, then incorporate it into the ricotta blend. Season with Italian seasoning, salt, and pepper.
03 -
Preheat oven to 375°F (190°C). Spread 1 cup marinara sauce evenly across the bottom of a 9 x 13-inch baking dish. Fill each pasta shell with approximately 2 tablespoons of ricotta-spinach mixture and arrange them open side up in the dish.
04 -
Spoon the remaining marinara sauce over the stuffed shells. Sprinkle with the remaining 1/2 cup of shredded mozzarella. Cover the dish with aluminum foil and bake for 20 minutes. Remove foil and continue baking for 10 additional minutes, or until cheese is golden and bubbling.
05 -
Let the baked shells rest for several minutes before serving. Garnish with fresh basil leaves and serve hot.