Heat a Dutch oven or large saucepan over medium-high heat. Add oil to pan; swirl to coat. Add carrot, onion, and celery; sauté 5 minutes.
While vegetables cook, pour 2 cups water and stock into a microwave-safe bowl; microwave at HIGH for 5 minutes. (This saves up to 10 minutes in the pot.)
Add hot stock mixture to pan; bring to a boil. Stir in thyme and pasta; reduce heat to medium, and cook 8 minutes.
Add chicken, salt, and pepper to pan; cook 2 minutes or until thoroughly heated and pasta is tender.
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