Deskin the chicken and place into the slowcooker with the bell pepper strips and onion. Mix the soy sauce and chicken broth in a measuring cup and pour over chicken. Add cumin, garlic, chili pepper flakes, salt and pepper. Stir well, cover and cook on high for 3 hours.
Whisk together the cornstarch, peanut butter, 1 Tbsp. soy sauce, and the lime juice. Add cup of the cooking juices from the crock. Mix carefully until smooth. Stir back into the crockpost to blend well, but without breaking up the meat.
Cover again, and cook for another 20 - 30 minutes until sauce is well thickened. Garnish with green onions, cilantro and peanuts. Serve with rice.