Preheat the broiler. Line a baking pan with foil or parchment paper and spray with nonstick cooking spray.
In a small bowl, combine the brown sugar, lemon pepper, garlic powder, salt and cayenne. Add the melted butter and stir to combine.
Brush the chicken with the butter mixture. Broil for about 5 minutes until the top is starting to turn golden brown, then flip the chicken and broil the other side for 5 minutes, until the top is golden brown and the chicken is cooked through.
Let the chicken sit for a couple of minutes, then slice and serve.