Combine chopped Romaine lettuce and baby spinach in a large mixing bowl to create the base.
Section the salad surface and arrange the diced grilled chicken, sliced hard-boiled eggs, crumbled turkey bacon, diced avocado, halved cherry tomatoes, and red onion in organized rows.
Whisk the red wine vinegar, extra virgin olive oil, Dijon mustard, sea salt, and black pepper in a small vessel until the mixture is fully emulsified.
Distribute the blue cheese crumbles evenly over the arranged ingredients.
Drizzle the vinaigrette over the salad immediately prior to serving to maintain the texture of the greens.