How to Make It
Preheat a gas grill to medium (350°F to 400°F). Meanwhile, mash cheese in a medium bowl using a whisk. Whisk in mayonnaise, sour cream, buttermilk, vinegar, lemon juice, and ¼ teaspoon each of the salt and pepper. Set aside dressing.
Brush lettuce wedges evenly with oil, and sprinkle with remaining ½ teaspoon salt and ¼ teaspoon pepper. Place wedges, cut sides down, on oiled grates. Grill, uncovered, until lettuce edges are browned and grill marks form, about 3 minutes per cut side.
Transfer grilled wedges to a serving platter. Drizzle wedges evenly with dressing, and sprinkle with bacon and chives before serving.