Begin by greasing your crock pot to prevent sticking.
Place the chicken breasts at the bottom of the crock pot. Add diced tomatoes, green bell pepper, and onion on top.
Sprinkle the chicken and vegetables with garlic powder, dried oregano, dried basil, salt, and pepper.
Break the spaghetti in half and layer it over the chicken and vegetables.
In a separate bowl, mix together cream of chicken soup, cream of mushroom soup, and chicken broth
Cover the crock pot and cook on low for 4-6 hours or until the chicken is cooked through, and the spaghetti is tender.
Sprinkle shredded cheddar cheese over the top during the last 15 minutes of cooking.