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Bring a large pot of salted water to a boil. Add pasta and cook until al dente; drain and set aside.
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Preheat oven to 375 degrees.
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In a large bowl, mix pasta, ricotta cheese, half of the mozzarella cheese, egg, and half of the jar of spaghetti sauce.
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Lightly grease a 9x13 pan and spoon in pasta mixture. Top with remaining spaghetti sauce, followed by the parmesan cheese and the rest of the mozzarella.
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Bake for 25 minutes, then turn on the broiler. Cook 5 minutes more to get that nice, browned, cheesy crust on top.
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Enjoy!