Dice onion and put at bottom of slow cooker
Place chicken breasts in cooker
Combine salsa, canned diced tomatoes, and taco seasoning and put on top of chicken
Cook on low 7-8 hours or high 3-4 hours.
Remove chicken from slow cooker and shred. Return to slow cooker and stir in juices.
Serve in taco shells, on salads, pizzas or in bowls over rice!
