In a large saucepan, brown the chicken in oil. Add salt and pepper. Set aside on a plate.
In the same saucepan, brown veggies in the butter until tender. Sprinkle flour and celery seeds on them. Cook 1 minute while stirring. Add chicken stock while whisking and bring to boil always stirring. Put the chicken back in the saucepan and add the cream. Let simmer slowly about 5 minutes. Adjust seasoning.