Preheat your oven to 400℉.
In a medium bowl, combine the ricotta, spinach, garlic powder, salt and pepper to taste, garlic powder, and 1/2 cup of the cheese. Mix well to combine.
Lightly grease a 9x13 pan and add one cup of sauce to the bottom.
Fill each shell with 2 tbsp of the ricotta mixture and lay them across the sauce in a single layer.
Cover with the remaining sauce and top with shredded cheese.
Cover with foil and bake for 20 minutes before removing the foil and baking for another 5-10 minutes.
Let rest for 10 minutes before serving!