If making chicken in slow cooker beforehand: season both sides with salt and pepper. Place in bottom of slow cooker and drizzle Italian dressing. Pour chicken broth into the bottom and close with lid. Cook on low 6 hour or high 3 hours. Remove from slow cooker and wait until cool enough to handle. Shred using two forks.
Layer romaine lettuce, cherry tomatoes, turkey bacon, avocado and chicken on a plate.
Whisk mayo and mustard with a splash of vinegar and drizzle over salad or serve on the side. Top with boiled eggs.