Tangy blue cheese, bacon, and crisp lettuce combine with shredded chicken breast in this hearty sandwich, which can be made using reserved extra ingredients from our Cobb Salad.
In a small bowl, whisk together blue cheese, sour cream, mayonnaise, and buttermilk until smooth. Season with salt and pepper.
Lightly toast bread. Divide avocado among 4 slices, along with bacon, tomato, and chicken. Top with eggs, and drizzle with blue cheese dressing. Sandwich with remaining slices.