I think this was Brian's recipe?

Crockpot Chicken Tacos

INGREDIENTS:
6 boneless, skinless chicken breasts
A chopped onion
A chopped green pepper
1 packet taco seasoning (or make your own with chili powder, cumin, garlic powder (or fresh garlic), salt and pepper)
16 ounces salsa (that's 2 cups if you're using a larger bottle).
I'd add a small can of corn to the pot also...

Flour tortillas, corn tortillas, or taco shells
Toppings: your choice of lettuce, sour cream, grated cheese, tomatoes, salsa, olives, guacamole, etc.

DIRECTIONS:
Put the chicken in a Crockpot. Add the onion and pepper.
Mix the seasoning with salsa and pour over chicken. You can add some more water if you think it needs more liquid, but the salsa and the chicken will produce ample liquid as it cooks.
Cover and cook on high for 4 to 6 hours or low for 6 to 8 hours.
The chicken is done when it can be shredded easily with a fork.
Lift the chicken out and shred it with a fork.

Serve with soft flour tortillas (I toast them on a dry flat skillet), a spoonful of the veggies if you used them (lift them with a slotted spoon to drain out excess liquid), and your favorite toppings.
Try any combination of lettuce, sour cream, shredded cheese, olives and tomatoes. (or whatever else you like).