In a small bowl, combine the Greek yogurt, mayo, chives, and garlic. Finely grate the zest of the lemon into the same bowl. Season the chive-yogurt sauce to taste with salt and pepper.
In a medium glass bow, spread ½ cup of the chive-yogurt sauce on the bottom. Sprinkle 3 tablespoons of the bacon on the yogurt sauce. Top with half of each the eggs, blue cheese, tomatoes, chicken, and all of the avocado. Squeeze the juice of half a lemon over top and season with salt and pepper. Spread the remaining chive-yogurt sauce over top.
On the top of the dip, arrange the remaining tomatoes, chicken, blue cheese, eggs, and bacon into rows. Squeeze the other lemon half over top. Garnish with more chives.
Serve with romaine lettuce leaves and Ritz crackers.
Pro tip! The yogurt chive dip can be made ahead of time and refrigerated for up to 2 days, and assembled with toppings when ready to serve.