Someone tweeted this recipe to me several months ago and it quickly became one of my kids' favorites. And since it's probably one of the easiest things I've ever made in my life, it's one of my favorites too :D
Here's what you need:
4-6 chicken breasts (I use frozen - you could also use thighs)
A jar of salsa
Put the chicken in the pot, sprinkle with salt and pepper
Pour half to the whole jar of salsa over the top (just get them nice and covered, you generally don't need the whole jar)
Sprinkle 1 to 1 1/2 Tbsps of taco seasoning over the top
Crank it on high for 5-6 hours. I'll check it out 5 hours in and see how tender it is. Once you can easily shred it, do so, then let it go for another 20 mins or so.