Add vegetables, broth, seasonings, and chicken breasts to the crockpot. Cook on LOW for 4–5 hours or HIGH for 2.5–3 hours until the chicken becomes tender and fully cooked. This slow cooking process builds flavor while keeping the chicken moist and soft.
Remove the chicken from the crockpot and shred it into bite-sized pieces using two forks. Return the shredded chicken to the crockpot so it can absorb more flavor from the broth and vegetables.
Stir in the uncooked rice, cream of chicken soup, cream cheese, and heavy cream until fully combined. Make sure the rice is submerged so it cooks evenly and absorbs the creamy broth properly.
Cover and cook on HIGH for another 30–40 minutes until the rice becomes tender and the mixture thickens. Stir once during cooking to help prevent sticking and encourage even creaminess.
Stir in shredded cheddar cheese until melted, then let the dish rest for 5 minutes before serving. This resting time helps the sauce thicken slightly for a richer texture.