Creating Easy Spinach and Ricotta Stuffed Shells is simple if you follow these steps:

1. Preheat the Oven: Start by preheating your oven to 375°F (190°C).
2. Cook the Pasta: Boil the pasta shells in salted water according to package instructions. Drain and set aside.
3. Prepare the Filling: In a mixing bowl, combine the chopped spinach, ricotta, half of the mozzarella, Parmesan cheese, salt, and pepper. Mix until well combined.
4. Stuff the Shells: Use a spoon to gently fill each pasta shell with the cheese and spinach mixture.
5. Layer the Sauce: Spread a layer of marinara sauce on the bottom of a baking dish to prevent sticking.
6. Arrange the Shells: Place the stuffed shells in the baking dish, open side up, and cover with the remaining marinara sauce.
7. Top with Cheese: Sprinkle the remaining mozzarella cheese over the stuffed shells for a gooey finish.
8. Cover with Foil: Cover the dish with aluminum foil to keep the shells moist while baking.
9. Bake: Place in the preheated oven and bake for 25 minutes.
10. Uncover and Brown: Remove the foil and bake for an additional 5-10 minutes until the cheese is bubbly and golden.