Mix the brown sugar, soy sauce, sesame oil, ginger and rice vinegar in a small bowl. Stir until sugar is dissolved. Set aside.
Heat a large skillet over medium-high heat. Brush top/skin side of chicken with the 1 tbs oil.
Place chicken, skin/top side down in heated skillet. Brown for 3-5 minutes–until chicken releases freely. Turn and brown on other side. Remove to plate; drain fat from skillet and wipe with a paper towel.
Place chicken back in skillet, skin/top side up. Pour soy sauce mixture over chicken.
Bake for 25-30 minutes, or until internal temperature of chicken is 170 degrees and/or juices run clear.