Place the boneless skinless chicken breasts at the bottom of your slow cooker. If using frozen chicken, add it straight to the pot!
Sprinkle the taco seasoning evenly over the chicken breasts.
Add the chopped green bell pepper, drained corn, and rinsed black beans on top of the chicken.
Pour in 1 to 2 cups of salsa, depending on how saucy you like your dish.
Cover the slow cooker and set it to low for 6-8 hours or high for 3-4 hours.
Once cooked, remove the chicken, shred it, and return it to the slow cooker, stirring to combine.
Prepare your rice according to package instructions.
Serve the Slow Cooker Tex-Mex Chicken over a bed of rice and garnish with cilantro, green onions, sour cream, cheese, and diced tomatoes.