Place the olive oil, chopped onion, carrots, and celery in a large soup pot or dutch oven. Cook over medium heat until soft, about 7 minutes.
Add the chicken thighs, salt, pepper and chicken broth to the pan. Bring to a boil, then reduce heat slightly and simmer for about 25 minutes until chicken is cooked through.
Use a slotted spoon to remove the chicken thighs from the pot and place them on a plate. Chop the chicken into small pieces and return to the pan.
Take about half of a box of gluten free spaghetti or fettucine and break into small pieces. Place the pasta in the pot and simmer until the pasta is tender, about 15 minutes.
Season with more salt and pepper to taste before serving if desired.
Notes
Store leftover soup in the refrigerator. It should stay good for 3-4 days.The pasta may soak up a lot of the broth as it sits in the refrigerator. You may need to add more broth when serving the leftover soup.If you don't want to use noodles, you can use rice, potatoes, quinoa, or cauliflower rice.If you aren't gluten free, feel free to use your regular pasta.