01 -
Place chicken breasts, sliced carrots, diced onion, minced garlic, bay leaves, Italian seasoning, kosher salt, and black pepper into an 8-quart slow cooker. Pour in unsalted chicken stock and stir gently to combine.
02 -
Set slow cooker to low and cook for 5 to 6 hours, or on high for 3 to 4 hours, until chicken and vegetables are tender.
03 -
Remove chicken from the slow cooker, dice, shred, or chop it, then return it to the pot and stir to combine.
04 -
Break spaghetti noodles into 2 to 3 inch pieces, add to the slow cooker, and stir to ensure noodles are submerged in liquid. Continue cooking on low for 25 to 30 minutes, stirring halfway through, until noodles are tender. Adjust seasoning to taste.
05 -
Ladle soup into bowls, garnish with fresh chopped parsley if desired, and serve immediately.