Pat the chicken breasts dry and season them with garlic powder, smoked paprika, salt, and black pepper. Place them in the slow cooker.
Pour the barbecue sauce and chicken broth over the chicken. Stir gently to coat, then cover and cook on low for 6 hours or until the chicken shreds easily.
While the chicken cooks, preheat the oven to 400°F. Scrub the potatoes, poke each one several times with a fork, and place them on a baking sheet. Bake for 50 to 60 minutes until tender.
Remove the chicken from the slow cooker and shred it with two forks. Return the shredded chicken to the slow cooker and stir it into the remaining sauce.
Slice each baked potato open lengthwise and fluff the insides with a fork. Spoon the BBQ pulled chicken into each potato.
Top each potato with shredded cheddar cheese and sliced green onions. Serve right away.