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Preheat oven to 350F.
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Add spinach in a colander and press out excess liquid.
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Place spinach, ricotta, parmesan, mozzarella, garlic, egg, salt, and pepper in a bowl and mix.
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Play down a layer of sauce in a large baking pan (about 21 x 26cm).
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Transfer filling to a piping bag, or a sturdy zip lock bag (cut an opening in the corner of the bag), and begin piping the filling into the cannelloni. Place in baking dish.
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Pour remaining sauce all over, cover with tinfoil, and cook for 30 minutes.
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Remove foil from cannelloni, sprinkle cheese all over, and cook for another 10-15 minutes. Enjoy!