First, you need to cook the chicken in the crockpot. Add the raw chicken breast, cream of chicken, diced onion, chicken broth, cheddar cheese soup into the crockpot and cook on high for 3 hours. This is a recipe you have to cook on high because of the rice.
After that time, remove the chicken. Shred it and chop it up then place it back in the crockpot.
Now, add the broccoli florets and the rice into the crockpot. Give it a good stir.
Then, after 20 minutes comeback and stir it again. Repeat 20 minutes after that. At the one hour mark the rice should be done and you can turn off the crockpot. Remember, rice cooks in 20 minutes on the stove. If you leave it in there longer than 1 hour it will start getting mushy, I've tested it.
Season to taste with salt and black pepper then serve.