Place the chicken breasts in the slow cooker.
In a medium bowl, mix the cream of chicken soup, chicken broth, garlic powder, and Italian seasoning.
Pour the mixture over the chicken in the slow cooker.
Cover and cook on low for 6-7 hours or high for 3-4 hours.
About 30 minutes before serving, prepare the spaghetti according to package instructions.
Once cooked, shred the chicken in the slow cooker using two forks.
Stir in the shredded cheddar cheese until melted and creamy.
Add the cooked spaghetti to the slow cooker and gently mix to combine.
Serve warm, garnishing with extra cheese if desired.