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