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In the same pan as the add the butter and melt, whisk in flour until smooth and will become the consistency of paste.
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Slowly pour in the chicken broth and whisk until smooth.
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Whisk in the parmesan cheese; the sauce will thicken.
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Add the cream, thyme, and salt/pepper; whisk until well combined.
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Slowly add the pasta water until the sauce is smooth and thinned to a desired consistency.
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In the pasta pot, combing the pasta, sausage-veggies mix, and sauce; stir well.
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Add the canned tomatoes, undrained to the mixture.
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Serve immediately, top freshly grated parmesan cheese.