Making Easy Spinach and Ricotta Stuffed Shells can be straightforward if you follow these simple steps:

1. Preheat Oven: Start by preheating your oven to 375°F (190°C).
2. Cook Pasta Shells: Boil a large pot of salted water. Cook the pasta shells according to the package instructions until al dente. Drain and set aside to cool slightly.
3. Sauté Spinach: In a skillet over medium heat, add chopped spinach. Cook until wilted, about 3-4 minutes. Remove from heat and let it cool slightly.
4. Mix Filling: In a bowl, combine ricotta cheese, sautéed spinach, egg, garlic powder, Italian seasoning, salt, and pepper. Mix until smooth and well-combined.
5. Stuff Shells: Fill each cooked pasta shell with a generous spoonful of the filling, then place them in a baking dish. Pour marinara sauce over the stuffed shells. Top with mozzarella and Parmesan cheese.
6. Bake: Cover the dish with aluminum foil and bake for 20-25 minutes. Remove the foil and bake for an additional 5-10 minutes, until the cheese is bubbly and golden.
7. Serve: Remove from the oven and allow to cool for a few minutes before serving.

These steps will guide you through preparing this incredible dish smoothly.