Place the chicken in a slow cooker insert. I use a 5 quart.
Season the chicken with salt.
In a medium saucepan, stir remaining ingredients together until combined.
Heat over medium-low sauce just until sauce begins to bubble, stirring regularly.
Remove sauce from heat, and pour over chicken breast.
Cover, and cook over LOW for 4-5 hours, or until chicken shreds easily with 2 forks.
Turn slow cooker to WARM, and let shredded chicken sit in sauce for 30 minutes before serving.
Notes
I recommend using regular-sized chicken breasts. Chicken halves or chicken breast filets can dry out while cooking.
This is the sauce from canned chipotle peppers in adobo sauce. The sauce is not spicy. However, if you would like to add more heat to the sauce, add more adobo sauce or use the chipotle peppers.