Combine chicken breasts, vegetable diced tomatoes, approximately eight cups water (or sufficient to fill the entire dish by about 1 inch) chopped parsley, garlic salt and pepper in the slow cooker.
Cover and cook at LOW for 4-6 hoursor until the chicken is cooked.
Take chicken breasts out of the slow cooker, then shred them. Mix the vegetables gently in the soup 3-4 times.
Make ditalini pasta as per instructions on the package and then take it off and drain.
Add the chicken shredded and cooked noodles to slow cooker, and stir.