Prep the base: Add the diced onion, bell pepper, garlic, beans, corn, diced tomatoes, tomato sauce, and broth to the crockpot.
Stir in all taco seasoning spices. Taste the liquid and add a pinch of salt if needed.
Add the chicken: Nestle the chicken breasts into the mixture so they’re mostly submerged.
Cook low and slow: Cover and cook on Low for 6 to 7 hours or on High for 3 to 4 hours, until the chicken is tender and easily shreds.
Shred the chicken: Remove the chicken to a cutting board and shred with two forks. Return it to the crockpot and stir.
Brighten it up: Stir in the lime juice.
Taste and adjust seasoning with additional salt, pepper, or chili powder.
Serve: Ladle into bowls and top with cilantro, avocado, a dollop of Greek yogurt, a sprinkle of cheese, and a squeeze of lime. Add jalapeños or crushed tortilla chips if you want extra heat or crunch.