Cut up the chicken into bite size pieces.
In the base of the slow cooker, whisk together the OJ concentrate and the brown sugar, ginger, and garlic powder. Stir in the chicken pieces and vegetables into the sauce.
Set the slow cooker on low and cook for 8 hours.
Just before serving, whisk in the cornstarch into the sauce. Let sit for 10 minutes with the slow cooker on warm.
Prepare noodles and brown rice.
Serve Slow Cooker Orange Chicken over the rice or noodles with crushed red pepper.