- Preheat the oven to 375 degrees. Cook pasta according to package directions.
- Heat oil in a large skillet. Add onion and cook until tender about 3-4 minutes. Add in garlic and cook for an additional minute.
- Add the spinach and cook until wilted, about 2 minutes.
- Transfer the spinach mixture to a large bowl and add in ricotta, mozzarella, Parmesan, egg, salt and pepper. Stir to combine.
- Spread about 1/2 of the sauce in the bottom of a 8 x8 or 9 x 9 baking dish.
- Stuff shells with the spinach cheese mixture and place in the baking dish.
- Top with the remaining sauce and bake for 20-30 minutes or until warmed through.
- Serve immediately with basil and parmesan cheese, if desired
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