I've made it many times & I use the wadded up alum. foil balls for the bottom of the crockpot. After cleaning/washing the chicken I spray chicken inside & out with olive oil spray & then sprinkle the chicken really good with Lawry's Seasoned Salt inside & outside. It always turns out delicious. Here's a recipe that I use. I can't remember if I sprayed my crockpot with olive oil spray or not but I think I did.
https://www.food.com/recipe/crock-po...chicken-158665