Place sweet potatoes, apricots, raisins, pineapple and garlic in a slow cooker coated with cooking spray. Top with chicken breasts and ginger dressing. Sprinkle with onion flakes and red pepper flakes. Cover and cook on LOW 5 to 6 hours or until chicken is tender.
Combine cornstarch with reserved 2 tablespoons reserved dressing, and add to chicken mixture to thicken sauce.
Prepare rice in a saucepan according to package directions using 1 ¼ cup water and ¾ cup reserved pineapple liquid in place of some of the water. Set aside and keep warm.
To serve, spoon rice evenly onto 4 plates. Top each with a chicken breast and the sweet potato mixture. Sprinkle with onions.