Heat 1 tablespoon butter and 1 tablespoon oil a nonstick pot over medium-high heat.
Add onion, garlic, carrots, celery, green pepper and saute for about 4-5 minutes until garlic is fragrant. Transfer to slow cooker (6 quart or larger).
In the same pan, add remaining 1 tablespoon butter and 1 tablespoon oil.
Add chicken and saute both sides until no longer pink. Transfer to slow cooker too.
Tip: Use a multifunctional slow cooker that allows you to saute the veggies in the slow cooker. This way, you won’t have to make another pot or pan dirty.
Add broth, diced tomatoes, Italian seasoning, ground cumin, salt, pepper, bay leaf, rice and mix everything until combined.
Cover and cook on High heat for 4 hours or until vegetables are tender and rice is cooked through.
Remove chicken from crockpot and shred it with two forks or cut it into small slices. Transfer it back into the crockpot.
Also, mix in corn and peas. If you feel that the soup is too thick per your preference, this would be the time to mix in additional broth to thin it out.
Let it cook on High heat for 30 minutes. If you want to reduce the liquid, then cook uncovered but if you are happy with consistency, cook covered.
Mix everything one final time.
Discard bay leaf.
Garnish with fresh parsley.
Optional: Squeeze some fresh lemon juice on top of the soup for a zesty flavor and enjoy.