INGREDIENTS
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2 tbsp. butter
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1 large onion, thinly sliced
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Kosher salt
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Freshly ground black pepper
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2 cloves garlic, minced
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1 tbsp. fresh thyme leaves, plus more for garnish
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1 packet French onion soup mix (such as Lipton's)
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1 lb. penne pasta
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2 c. beef broth
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2 c. water
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1/4 c. heavy cream
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1 1/2 c. shredded Gruyere