In a jar, shake together or whisk together the vinegar, mustard, and oil and season with salt and pepper.
Rather than frying, I like to bake bacon in the oven. To do this, place long pieces of foil over a baking sheet. I like to overlap 2 to 3 long pieces of foil so there's less mess. Arrange the bacon strips on top of an oven safe rack placed on top of the foil, or on top of the foil directly, in one even layer, being sure not to overlap slices. Bake at 425 degrees F for 12 to 20 minutes (20 to 25 minutes for extra crispy bacon).
On a large platter, spread out lettuce, and then add rows of all the ingredients: pecans, jammy eggs, chicken, bacon, avocado, blue cheese, and tomatoes.
Season with salt and pepper if desired, drizzle with dressing, garnish with chives and enjoy!