Spray 6-quart slow cooker with non-stick cooking spray.
Spread minute rice evenly across bottom.
Place chicken breasts on top of rice.
In bowl, whisk together both soups and chicken broth until smooth.
Pour soup mixture evenly over chicken and rice.
Sprinkle onion soup mix over top.
Cover and cook on LOW 6-7 hours (DO NOT PEEK!).
If using frozen vegetables, add during last 30 minutes.
Let rest 10 minutes before serving.
Season with salt and pepper to taste.