Chop the chicken breasts into bite-sized pieces and season with salt and pepper.
Heat olive oil over medium in a large pot. Sauté the chicken pieces until they’re lightly browned on all sides.
Add chopped carrots and celery. Cook with the chicken for about 3 minutes, stirring here and there.
Pour in the chicken broth and water, then add the cream of chicken soup. Stir until everything’s combined and smooth.
Stir in the uncooked rice and parsley flakes.
Bring the soup to a light boil, then lower the heat and simmer it uncovered for 25–30 minutes, until the rice is tender and the veggies are soft.
Taste it, add more salt or pepper if you want, and serve hot.