Place the chicken breasts in an even layer at the bottom of the slow cooker.
Sprinkle the taco seasoning evenly over the top of the chicken.
Pour the undrained diced tomatoes, drained corn, and rinsed black beans over the seasoned chicken.
Place the cubed cream cheese evenly on top of the mixture.
Cover and cook on LOW for 6 to 8 hours or on HIGH for 3 to 4 hours, until the chicken is tender and easily shreds.
Carefully remove the chicken breasts to a cutting board and shred them using two forks.
Whisk the remaining liquid and melted cream cheese in the slow cooker until a smooth sauce forms.
Return the shredded chicken to the slow cooker, stir to coat in the creamy sauce, and garnish with fresh cilantro before serving.