Heat 1 TBS cooking oil in a large Dutch Oven or soup pot over medium high heat.
Add in chicken, season with 1/4 tsp salt & 1/4 tsp black pepper and sear until golden brown on both sides and cooked through until no longer pink. Remove cooked chicken to a plate and set aside.
Add an additional TBS of cooking oil to the same Dutch Oven over medium high heat. Add in diced carrots, celery, and onion. Sautee for 6-7 minutes until softened. Stir in garlic, 1/2 tsp salt & 1/2 tsp black pepper. Cook for 1 minute.
Add in butter and allow to melt into the vegetables. Add in flour and stir for 1-2 minutes until vegetables are well coated.
Stir in 6 cups of broth and bring to a boil over high heat.
Stir in uncooked rice, Dice or shred cooked chicken and add to the pot. Taste for needed seasonings. Lower heat to a medium and allow to cook for 25-35 minutes until rice is tender.NOTE: Keep an eye on the liquid level and add more broth if needed.
Turn off heat and stir in milk for a creamy consistency, if desired. Enjoy.