In a small bowl, mix together the cinnamon, cumin, coriander, oregano, chili powder, and salt.
Place the chicken into a bowl and rub the spice mixture into the pieces.
Add the tomato purée, chopped chili pepper, garlic, red onion slices, and lime juice. Mix everything together well. Cover and refrigerate for 15 minutes whilst you prepare all the vegetables, or if you have the time, marinate for 4 hours.
Turn the slow cooker to high. Place the pumpkin and sweet potato into the bottom of the pot.
Add the chicken, plus any of the marinade left in the bowl.
Pour over the chicken stock and canned chopped tomatoes.
Cook on high for a total of 6 hours, or on low for 8 hours.
Add the green beans and kidney beans one hour before the end of cooking time.
Serve on a bed of basmati rice topped with fresh coriander, lime wedges and a dollop of sour cream or low-fat natural yogurt (if following Slimming World) (optional)