Salsa Chicken

6 boneless, skinless chicken breasts
2 16 oz. bottles salsa
1 c. sour cream (optional)
2 c. cheese, shredded

Place chicken breasts in a crock pot that has been sprayed with a non-stick cooking spray. Cook on high 3 hours or until chicken is tender. Remove the chicken from crock pot and shred. Return to crock pot. If desired, spread sour cream over the top and sprinkle with shredded cheese. Cook an additional 30 minutes. Serve over rice, or in tortillas.