Pat the chicken dry with paper towels.
Mix the garlic powder, onion powder, paprika, cumin, salt, and pepper.
Rub the spice blend over all sides of the chicken.
Pour the broth and olive oil into the slow cooker.
Arrange the chicken in a single layer in the slow cooker.
Cover and cook on LOW for 4 to 5 hours or on HIGH for 2½ to 3 hours.
Check that the thickest part reads 165°F.
Move the chicken to a large bowl.
Shred the chicken with two forks.
Toss the chicken with ½ cup of the cooking juices.
Serve warm or cool and store.