Spray the inside of a small slow cooker with cooking spray, set to low.
Place chicken breast in slow cooker, cover with 1¾ cup salsa and the juice of one lime. Let cook on low for 8 hours.
Drain off all liquid, shred chicken and place back in slow cooker add the remaining ¼ cup salsa, the juice of one lime and the cumin and garlic powder. Stir mixture until completely coated with the seasonings and salsa. Let mixture warm all the way through, serve with chips or warmed corn tortillas.
Garnish with guacamole and additional limes.
Recipe by Maebells at http://www.maebells.com/slow-cooker-zesty-chicken-tacos/