Lay 3-4 chicken breast in your crock pot
Cover with about 1 1/2 cups salsa
Let cook on low 6-8 hrs or on high 4-6. About a half hour before serving shred up the chicken and add 3/4 cup sour cream keep in crock-pot until you are ready to eat.
Stuff into soft tortillas and garnish with shredded cheese and/or lettuce.
After it's all shredded and sour cream is added