01 -
Set your oven to 375°F (190°C). Boil the jumbo shells following the package directions. Drain and let them sit until cool enough to touch.
02 -
In a mixing bowl, combine ricotta, mozzarella, Parmesan, the egg, and chopped spinach. Add salt and pepper until it tastes how you like it.
03 -
Add half of the marinara sauce to the bottom of a baking dish. Take each shell, fill it with the cheesy mixture, and nestle them into the dish. Cover it all with the rest of the sauce.
04 -
Wrap the dish with foil and bake for 30 minutes. Remove the foil and bake for another 10 minutes until the cheese is gooey and bubbling. Add fresh basil on top before dishing it out.