Add the rice, chicken broth, cream of chicken, and chopped onions to the slow cooker.
Top with the chicken breasts and sprinkle the spices and seasonings throughout. Cook on high 2-3 hours until all liquid has been absorbed.
Open the pot and remove the chicken and shred or slice into cubes.
Return the chicken to the pot along with the frozen vegetables and shredded cheese.
Place the lid on the pot and slow cook on High for an additional 10-15 minutes or until the veggies are soft and the cheese has melted.