Place all ingredients in crockpot: chicken breasts, broth, dried oregano, garlic powder, salt and pepper.
Cover and cook on high for 2-3 hours or low for 4-6 hours, or until chicken is cooked through and shreds easily with a fork. You can use an instant read thermometer to check that the internal temperature of the chicken has reached at least 165° F.
Remove the chicken from the slow cooker, leaving the broth in the pot. Let the chicken cool slightly and then shred the chicken, using either two forks, your hands, or a stand mixer fitted with the paddle attachment. Stir in about ½ cup of the broth from the pot for flavor and moisture.
