Place the chicken breasts at the bottom of the crock pot.
Add the uncooked rice, chicken broth, and condensed cream of chicken soup.
Sprinkle the chopped onions, garlic powder, onion powder, salt, and pepper over the mixture.
Stir to combine everything, ensuring the rice is spread evenly at the bottom.
Cook on low for 4-6 hours, or until the chicken is cooked through and the rice is tender.
In the last 30 minutes of cooking, stir in the frozen mixed vegetables.
(Optional) In the last 10 minutes of cooking, sprinkle shredded cheddar cheese over the top and let it melt.
Serve warm and enjoy!