Place the chicken breasts in the slow cooker.
Pour the red enchilada sauce, fire roasted tomatoes, green chiles, and taco seasoning over the chicken.
Cover and cook on low for 8 hours.
Once cooked, shred the chicken with two forks inside the slow cooker.
Add the drained black beans and corn, stir to combine.
Layer the tortilla wedges over the mixture, then sprinkle the shredded cheese on top.
Cover and cook for an additional 10-15 minutes until the cheese is melted.
Serve warm and enjoy your delicious Crockpot Chicken Enchilada Casserole.