Season the chicken breasts and brown them in a pan with some cooking oil until cooked through.
Remove the chicken from the pan. Slice the red onion, add it to the same pan, and cook until caramelized.
While the onions are cooking, use two forks to shred the cooked chicken breasts.
Return the shredded chicken to the pan with the caramelized onions. Add the barbecue sauce and mix everything together.
Cut the brioche buns in half. Place the bottom halves in a baking dish and top them with grated mozzarella cheese.
Spoon the BBQ pulled chicken and onion mixture evenly over the cheese.
Top the chicken with bacon slices and cheddar cheese slices, then add the top halves of the buns.
Brush the tops of the buns generously with melted garlic parsley butter.
Bake in the oven for 5 minutes, or until the cheese is perfectly melted and the buns are warm.
Cook it hands-free.
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