In a large stock pot, cook the bacon pieces over medium heat for 5 minutes. Add the onion, celery, and butter. Cook for another 5 minutes, stirring frequently.things build up.
Sprinkle flour over the mixture and stir for another 3 or 4 minutes. Slowly whisk in the chicken broth and bring to a boil. Lower heat and simmer for 15 minutes.
Mix in your desired amount of salt and pepper and serve the soup hot, garnished with chopped green onions. Tap below to get the full recipe and ingredient amounts.