Begin by placing the boneless, skinless chicken breasts at the bottom of the slow cooker, ensuring they lie flat for even cooking.
In a medium-sized mixing bowl, combine the finely diced onion, minced garlic, diced bell pepper, drained black beans, corn kernels, taco seasoning, and the jar of queso sauce. Stir thoroughly until all ingredients are evenly mixed.
Carefully pour this vibrant mixture over the chicken breasts in the slow cooker, making sure the chicken is generously coated with the mixture.
Season the concoction with salt and pepper according to your preference.
Cover the slow cooker with its lid and set it to cook on low for 6-8 hours, or on high for 3-4 hours, until the chicken is fully cooked and easily shreddable with a fork.
Once cooking time is complete, use two forks to carefully shred the chicken directly in the slow cooker, stirring it into the queso mixture to combine well.
Allow the mixture to sit for an additional 10 minutes with the lid on, to let the flavors blend beautifully.
Serve the warm, cheesy queso chicken in your choice of tortillas. Top generously with freshly chopped cilantro, slices of avocado, and a squeeze of lime juice from the wedges.
Notes
For an inviting display, serve the tacos on a vibrant platter with lime wedges and avocado slices.