1. Slice lettuce into 1-inch strips; divide evenly among 4 individual salad plates.
2. Divide tomato, red onion, avocado, blue cheese, and bacon evenly over lettuce.
3. Sprinkle 1/4 of egg whites over each salad. Top each salad with 3 ounces grilled chicken strips and drizzle with 2 tablespoons blue cheese dressing.