Sprinkle chicken with salt and pepper. In a large cast-iron or other heavy skillet, heat oil over medium-high heat. Brown chicken on both sides. Remove from pan., Remove skillet from heat; add halved garlic cloves and brandy. Return to heat; cook and stir over medium heat until liquid is almost evaporated, 1-2 minutes., Stir in stock, rosemary and thyme; return chicken to pan. Bring to a boil. Reduce heat; simmer, uncovered, until a thermometer reads 170°, 6-8 minutes. Sprinkle with chives.