Cook the chicken breast your preferred way. I like to put mine in the instant pot, since it can be done quickly. Once the chicken is done dice or shredded and put the the side.
Melt the butter in a large stock pot. Then add the celery and onions and cook until softened.
Add the cubbed bread and mix.
Add the cooked chicken and stir.
Mix in the chicken broth and stir so that everything is coated.