- In a large crockpot, add the olive oil, diced onion, and bell peppers. Stir to combine. 
- Place the chicken breasts on top of the vegetables. Sprinkle the taco seasoning evenly over the chicken, then pour the salsa over everything. 
- Add the black beans and corn on top of the salsa. Season with salt and pepper to taste. 
- Cover the crockpot and cook on low for 6-8 hours or on high for 3-4 hours, until the chicken is cooked through and easily shreds with a fork. 
- Once cooked, shred the chicken in the crockpot using two forks and mix everything together. 
- Serve the chicken mixture in tortillas and top with your favorite toppings such as shredded cheese, sour cream, avocado, cilantro, and lime wedges.