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Steam green beans until slightly tender, about 6-8 minutes.
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Melt butter over medium heat in a large skillet.
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Add garlic and cook 1-2 minutes.
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Transfer steamed green beans to the melted butter and garlic. Toss to coat green beans evenly and continue to saute for approximately 5 minutes over medium heat.
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Season with salt and pepper to taste.
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Remove from heat and sprinkle grated parmesan.
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Toss once again until parmesan is melted, approximately 1 minute.