Place chicken in the bottom of the crockpot and season with salt, black pepper, garlic powder, onion powder, and Italian seasoning.
If desired, chop and add any vegetables to the crockpot.
In a medium bowl, combine cream of chicken soup, diced tomatoes, cream cheese, and chicken broth. Mix until well combined.
Pour the creamy sauce over the chicken in the crockpot, ensuring it is well covered. Cover and cook on low for 6-7 hours or on high for 3-4 hours.
Once the chicken is cooked, shred it in the crockpot and stir in uncooked spaghetti. Cover and cook on high for an additional 30-40 minutes.
Stir in shredded cheddar cheese until melted and creamy. Serve warm.