Spray the inside of your slow cooker with cooking spray. Lay the chicken in the bottom in a single layer.
In a bowl, whisk together red and green enchilada sauce, cream of chicken soup, Rotel, onion, taco seasoning, garlic powder, cumin, salt, and pepper.
Pour this sauce mixture over the chicken, making sure it is mostly covered.
Cover and cook on Low 5 to 6 hours or on High 3 to 4 hours, until the chicken is very tender and shreds easily.
Shred the chicken right in the crockpot using two forks and stir it into the sauce.
Stir in the tortilla strips and 1 ½ cups of the cheese blends, making sure the tortillas are coated and pushed down into the sauce.
Sprinkle the remaining cheese over the top, cover, and cook on High for 20 to 30 more minutes until the cheese is melted and everything is hot and bubbly.
Let it sit 5 minutes with the lid off, then scoop into bowls and add your favorite toppings.
