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In a large Dutch oven or soup pot, heat over medium-high. Add beef and onion, stirring until the beef is browned.
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Mix in garlic and red pepper flakes, cooking for an additional 30 seconds. Drain excess fat if necessary.
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Pour in the Prego Sauce, 6 cups of chicken broth, crushed tomatoes, tomato paste, balsamic vinegar, sugar, seasonings, bay leaf, and lasagna noodles. Allow the mixture to reach a boil before reducing to a simmer. Cook until noodles are tender (around 20-30 minutes).
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Remove the bay leaf. Introduce the heavy cream if using and additional chicken broth until you reach your preferred soup consistency.
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Serve hot, garnishing each bowl with the three cheeses to your liking.