Heat olive oil in a large pot or Dutch oven on the stove. Add in the celery, carrot, onion and garlic. Sauté for 2-5 minutes or until slightly translucent.
Add raw chicken, potatoes, broth and buffalo sauce in the pot. Bring to a boil. Once boiling, lower heat to a simmer and cook on medium heat for 30 minutes.
Once cooked, remove the large potato pieces and chicken.
Place large potato halves, milk + 1/2 cup of broth from the box into a blender and blend until smooth. Add this mixture back into the pot.
Place chicken breasts on a cutting board and shred. Put the shredded chicken back into the pot.
Stir together until combined and smooth.
Garnish with blue cheese or green onions and serve.
Enjoy!