I've never put anything frozen in the crockpot. I didn't think it was safe! Learn something new all the time!
Okay, our fave recipe for bone-in split chicken breasts is to have some carrots and potatoes cut into cubes and put at the bottom of the crockpot. Add one onion, cut into quarters. Add a about 2 cups of water. Place chicken on top. Sprinkle one whole dry onion soup mix packet over the top. Cover and cook on low all day.
Yum! Flip the breasts a time or two while cooking to mix the onion soup mix in with the veggies.
Serve with rolls and a green veggie!