In a small mixing bowl combine the brown sugar, fish sauce, water, rice vinegar, garlic, ginger, and red pepper flakes.Preheat a large skillet to medium-high heat. Add the olive oil and shallot to the skillet and cook for a few minutes. Next, add the fish mixture and chicken thighs to the skillet.Cook the chicken for about 10 minutes or until cooked through and caramelized.Transfer the chicken to a serving dish and serve white rice alongside. Enjoy!