Combine smoked paprika, garlic powder, onion powder, salt, and black pepper in a small bowl. Rub this spice mixture all over the chicken breasts, coating every surface evenly. This step takes just three minutes but delivers massive flavor impact throughout the meat as it cooks.
Layer the sliced onion on the bottom of your slow cooker. Place the seasoned chicken breasts on top of the onions. Pour the chicken broth around (not over) the chicken to keep it moist without steaming the spice crust away.
Cover and cook on low for six hours until the chicken shreds easily with two forks. Mia checked after five hours and said the meat was already falling apart, which means you can pull it out early if needed. The longer cook time ensures maximum tenderness and flavor absorption.
Remove the cooked chicken and shred it directly in the slow cooker using two forks. Stir in the bbq sauce, brown sugar, and apple cider vinegar to create this cozy labor day pulled chicken dinner's signature sauce. The vinegar cuts through the sweetness beautifully and prevents the dish from tasting one-dimensional.
Return the shredded meat to the slow cooker and stir thoroughly. Cook on low for an additional 20-30 minutes to allow the sauce to coat every strand. Taste and adjust seasonings—add more salt, vinegar, or bbq sauce depending on your preference.
Toast the hamburger buns in a skillet with butter over medium heat until golden brown, about two minutes per side. This step prevents soggy buns and adds a layer of richness that elevates the final sandwich.
Fill each toasted bun with pulled chicken and top with fresh coleslaw mix for crunch. Serve immediately while the meat is still warm and the buns are still crispy from toasting.