Preheat oven to 375°F (190°C).
Rub chicken thighs with olive oil and season both sides with salt and pepper.
Heat an ovenproof skillet over medium heat.
Place chicken thighs skin-side down and sauté for 3–5 minutes without moving until lightly browned.
Remove chicken and drain excess drippings.
In a bowl, mix brown sugar, soy sauce, vinegar, ginger, and garlic.
Return chicken to the skillet, skin-side up.
Pour the sauce over the chicken.
Roast for about 25 minutes, basting occasionally, until fully cooked and glazed.
Serve hot with the rich soy glaze spooned over the top.