Place chicken in bottom of crockpot.
Pour in 1 cup of chicken broth
Add seasoning package
Add peppers and onions
Stir well so everything is mixed together
Cook on low for 8 hours or high for 4 hours.
About 1/2 hour before fully cooked shred chicken in crock pot and stir again and let finish cooking - this helps with the flavors blending.
Add cheese to taco shell
Place chicken mixture on top of cheese
Add salsa
Add another layer of cheese
Place in toaster oven or microwave for 10 seconds to melt cheese
Top with sour cream