Boil the shells for about 10 minutes in salt water. They do not have to be completely done.
In a small bowl, thoroughly mix the ricotta, parmesan, mozzarella, and basil. Carefully spoon the mixture into the cooked pasta shells.
Pour the puréed tomatoes into a casserole dish and place the stuffed pasta shells on top, the openings facing upwards. Drizzle the olive oil over the shells, and add a little extra grated mozzarella. Now bake for 30 minutes at 320°F.
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Notes
Feel free to spice up the tomato purée with seasonings of your choice. Serve and enjoy!