Place chicken breasts in the bottom of a slow cooker.
Cover chicken with the next 5 ingredients and cook on low for 6 hours or high for 4 hours.
Once the chicken is done, spoon spaghetti sauce into a greased casserole dish.
Place cooked chicken breasts on top of a low-carb spaghetti sauce. (Chicken may break in pieces since it is tender.)
Sprinkle parmesan cheese and mozzarella cheese on top of chicken breasts.
Turn oven on broil and place chicken on the top rack of the oven.
Broil for 2-3 minutes or until the mozzarella cheese begins to brown.
Serve on either spaghetti squash or whole grain noodles if you don't eat low-carb.