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preheat oven to 400°.
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mix garlic and butter in a large bowl until garlic is evenly distributed.
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add squash, sausage, cheese, salt, and pepper and toss until squash is evenly coated in garlic-butter mixture.
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scrape into a medium heatproof skillet, cover tightly with foil, and bake 20 minutes.
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remove foil and continue to bake until squash is tender and lightly browned around the edges, 20 minutes more.