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Preheat the oven to 350 degrees F. Coat a 9"x13" pan with cooking spray.
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Boil water and cook the pasta according to the package instructions. Drain and set aside.
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Heat the olive oil in a large pan over medium high heat.
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Add the sausage to the pan and cook it for 3-4 minutes, breaking it up into small pieces with a spoon. Add the onion to the pan, and cook for 5 more minutes or until the sausage is cooked through and the onion has softened.
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Add the garlic and cook for 20 seconds. Add the marinara sauce and tomato sauce bring the sauce to a simmer.
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Let the sauce simmer for 5 minutes or until just thickened
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Toss the cooked pasta with the sauce.
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Pour the pasta mixture into the prepared pan and top with mozzarella cheese.
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Bake covered for 20 minutes, then uncover and bake for another 15-20 minutes or until pasta is bubbly and cheese is melted and browned.
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Serve hot and enjoy!
