For the dressing: In a medium bowl, whisk together the blue cheese, oil, mayonnaise, vinegar and hot sauce. Season with salt and pepper and add more hot sauce if preferred. Set aside.
For the salad: Divide the lettuce rounds among 4 plates. Pour 1/2 cup of the dressing over each. Top each with one-quarter of the tomatoes and bacon. Sprinkle some chives on top. Serve immediately.