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Place a pot of water to a boil. Add salt
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Cook pasta for 6 minutes (or at least 2-3 minutes before al dente)
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In a skillet over medium heat add the olive oil
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Cook the onion and garlic until softened. Add the Italian seasoning, salt and pepper
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Add the spinach and continue cooking until softened
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Add the tomato puree and simmer for 2-3 minutes. Whisk in the ricotta until combined
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Drain the pasta in a colander and mix it in with the tomato sauce
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Place entire contents in an oven safe dish
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Preheat the broiler
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Sprinkle mozzarella cheese on top
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Broil for 2-3 minutes or until the cheese has melted and starts toasting up
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Enjoy!