Preheat your oven to 375°F (190°C). Wash and slice the peppers lengthwise, then remove the seeds and membranes. Arrange the pepper halves in a greased baking dish, cut-side up, so they’re ready to fill.
In a bowl, combine shredded chicken, hot sauce, melted butter or oil, garlic powder, onion powder, and salt. Mix until the chicken is evenly coated. Add most of the cheese (saving some for topping) and fold it gently into the mixture.
Fill each pepper half generously with the chicken mixture. Top with the remaining mozzarella for a melty finish. Bake for 25–30 minutes until the peppers soften and the cheese becomes golden and bubbly. Broil for 1–2 minutes if you want a more caramelized top.