01 - Fry bacon in a large skillet over medium heat until crispy, approximately 8–10 minutes. Transfer to a paper towel-lined plate to drain excess grease. Once cooled, crumble into bite-sized pieces.
02 - In a large salad bowl, combine chopped romaine lettuce, halved cherry tomatoes, diced avocado, and thinly sliced red onion.
03 - Whisk together mayonnaise, sour cream, Dijon mustard, apple cider vinegar, lemon juice, salt, and pepper in a small bowl until completely smooth and well incorporated.
04 - Add crumbled bacon to the vegetable mixture. Drizzle the prepared dressing evenly over the salad and toss gently to coat all ingredients thoroughly.
05 - Sprinkle chopped chives over the top as garnish, if desired. Serve immediately while the bacon remains crispy and the vegetables are fresh.