This is one of my favorite recipes from this site (the only one I like more is the instant mashed potato gnocchi).
I've not made it this year, yet, because I'm still in active diet mode and, well, this thing isn't really diet friendly. And it's SO damned good I want to eat the entire thing.
For the most part I've subbed out the shredded chicken and use ground turkey, and as I noted below, I make my own red sauce, although I really should try green sauce.
I'm going to try Mexican cheese in it next time instead of "Mexican cheese blend," which is often mostly cheddar.
I figure asadero and manchego for the primary cheese because they melt so nicely and queso blanco sprinkled over the top (especially if I can find one that's made with lime juice).