Cut the chicken thighs into cubes. Season with salt and pepper.
Add olive oil to a large pot over medium heat. Once the olive oil has warmed, add the seasoned chicken breasts. Allow to cook, stirring the chicken so it doesn't get stuck to the bottom, for about 8 minutes until cooked through.
Remove the chicken and place in a bowl to the side. Add the chopped onion to the large pot, season with salt and pepper, and allow to cook until just starting to become translucent. About 3 minutes.
Then add the minced garlic, celery, and carrots. Stir around and allow to cook for 2-3 minutes.
Add the chicken back to the pan and add the onion powder, garlic powder, and red pepper flakes. Stir to fully combine.
Add the chicken broth and allow it to come to a boil.
Cook for 10 minutes then add the star pasta and cook for 8 more minutes or until the pasta has cooked all the way.
Taste the soup and season with more salt and pepper if it needs it.
Serve and enjoy!