Preheat your oven to 375 degrees F. and prepare a large baking dish.
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In a large skillet, heat the olive oil over medium-high heat, then add the onions and garlic. Saute for 5 minutes until fragrant then add the diced squash and mushrooms.
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In a small bowl, combine the ricotta with the spinach, season with Italian seasoning, and mix well.
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Cover the bottom of the baking dish with pasta sauce, then add a layer of pasta.
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