Heat the oil over medium heat in a large skillet and sauté the onion, capsicum/bell pepper and garlic for 5 minutes until translucent.
Add a splash of chicken broth, bring to simmer then tip it all into the slow cooker. (Instant Pot: Do Step 1 & 2 on saute function).
Add remaining chicken broth, Spices, corn, bean and tomato. Give it a good stir, then add chicken and push down to submerge.
Slow cook for 6 to 8 hours on LOW. (Or pressure cooker 25 minutes on high, see Note for stove).
Remove chicken onto plate, shred with 2 forks. Return into slow cooker, give it a good stir. Check if it needs more salt or pepper.
Ladle into bowls and serve with Toppings of choice!
