Spray bottom of the crockpot with olive oil.
Layer onions, garlic, carrots, mushrooms, celery, and beans. Season with salt, pepper, tablespoons of the onion powder, one tablespoon of the garlic powder, and chili flakes if desired. Top with chicken, season with an additional tablespoon each of onion powder and garlic powder, and coat with crushed tomatoes. Top with jalapeno slices, if using.
Cook on low for approximately eight hours. Use two forks to gently shred the chicken directly in the crockpot. Mix to combine and serve.
Sponsored by Gefen