Preheat your oven to 425°F. Prepare a baking dish by lightly greasing it or lining it with foil for easier cleanup.
In a mixing bowl, combine brown sugar, minced garlic, hot sauce, soy sauce, chicken stock, and black pepper. Stir until the sugar is mostly dissolved.
Place the chicken thighs in the prepared baking dish and pour the sauce mixture over them, making sure each piece is well coated.
Bake in the preheated oven for 35 to 40 minutes, or until the chicken is cooked through and the internal temperature reaches 165°F. Baste the chicken with the sauce from the dish every 10 minutes to keep it moist and flavorful.
Once cooked, remove the chicken from the oven and let it rest for a few minutes before serving. This allows the juices to redistribute, ensuring the chicken will be juicy and delicious.