Place chicken breasts into bottom of stockpot, add chicken broth, bay leaf, butter, chicken base, garlic powder, celery and onion. Cover, bring to a simmer, and simmer for 1 hour. Remove chicken to a small baking sheet, cover with foil.
Raise pot of broth to boiling, add frozen noodles, stir, and cook (covered), for 5 minutes. Stir, lower heat to medium low, cover and continue to boil until tender, stirring every 5 minutes. (Another 15 - 17 minutes.)
While noodles are cooking, with 2 forks pull chicken into bite-sized chunks, then re-cover so it doesn't dry out.
When noodles are done, stir in soups until well combined. Fold in chicken, add salt and pepper. Simmer one minute. Cover, set aside, and let rest at least 5 minutes.
*The next day, add more or all of the rest of the chicken broth to refresh, as the noodles will soak up quite a lot of the broth overnight. Add more salt to taste as well.