Cobb Chicken Salad Two Ways

Name: Cobb Chicken Salad Two Ways
Ingredients: 4 large eggs; 8 slices bacon; 1/2 cup mayonnaise; 1/4 cup buttermilk; 1/4 cup sour cream; 2 dashes Worcestershire sauce; 1 cup crumbled blue cheese; 1 tablespoon chopped fresh chives, plus more for garnish; Kosher salt and freshly ground black pepper; 2 cups shredded rotisserie chicken; 1/2 cup grape tomatoes, halved; 3 scallions, chopped; 1 avocado, diced; 1 small bunch fresh parsley, plus more for garnish; Salad greens, for serving, optional; 12 slices sourdough bread, optional