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Blend spinach in a food processor until shredded. Remove and set aside.
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Add onion, bacon, garlic, salt, pepper and mushrooms to the food processor pulse until all ingredients are ground. Add beef and pulse until combined.
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Preheat a large pot or pan to medium-high heat and add beef mixture from the food processor. Cook for 5-7 minutes, stirring occasionally until meat has browned.
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Add thyme, pasta and broth to pan. Bring to a boil and cook for 11 minutes at a strong simmer (over medium heat) or until pasta is cooked al dente. Add spinach, stirring to fully combine and remove from heat.
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Preheat oven boiler to high. Top pasta with swiss cheese and place under broiler for 2-4 minutes or until cheese is melted and starting to brown.
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Allow pasta to cool for about 5 minutes before serving.