I used Trader Joes frozen chicken that you get in the big bag (that is super inexpensive). Now, I've read Trader Joe's does something special with their freezing process so you don't have to thaw it before you cook it. And seeing that I have such a problem with raw chicken I just threw the frozen chicken in the pot to see how it would do. I also read that if you use frozen chicken in a crock pot you have to cook it on high not low.
So I just placed chicken in the crock pot with enough broth and water to almost cover the chicken. I think I threw in a little Tejin salt, pepper, seasoning for added flavor, but garlic powder would do just as well. Cover and let cook for 4 hours on high (it did come out a little dry after 4 hours, probably because it was frozen so I will cut down on the cooking time next time I make it) . After cooking shred chicken with 2 forks. I ended up making chicken enchiladas, shredded chicken tacos, and chicken salad sandwiches with it. All were very different dishes because of the different spices I added to it, but all were SUPER easy because the chicken was already made. Now if I can just remember to cook the chicken on Sundays to have it prepared for the week to come I would feel like an unbelievably productive person. The odds of me remembering that are low, but I am extremely happy that I have the option none the less.