Cook ground chicken in microwave or stove until chicken is no longer pink, 3-5 minutes.
Drain off liquid and transfer mixture to slow cooker. Crumble chicken and stir in bell pepper, onion, garlic, hoisin sauce, soy sauce, ginger, ¼ teaspoon salt and ⅛ teaspoon black pepper.
Cover and cook on low until chicken is tender, 1 ½ to 2 hours.