Step 1

In a medium saucepan, heat oil over medium-high. Add carrots, celery, and onion; season with salt and pepper. Cook, stirring occasionally, until vegetables are crisp-tender, 3 to 5 minutes.

Step 2

Add broth, chicken, rice, and 1 1/2 cups water to pan. Bring to a boil; reduce to a simmer, and cover. Cook until chicken is opaque throughout, 6 to 8 minutes. With a slotted spoon, transfer chicken to a cutting board. When cool enough to handle, shred with two forks.

Step 3

Meanwhile, continue to cook soup, uncovered, until rice is tender, 6 to 8 minutes. Return chicken to pan; simmer until heated through, about 1 minute. Season with salt and pepper. (To store, place in airtight containers, and refrigerate up to 2 days; reheat over medium, about 10 minutes.)