Preheat oven 350°F

Cook chicken (if not using deli or leftovers)

Toast walnuts until golden brown, approximately 8 minutes

Prep: chop walnuts. Slice bacon. Bite size pieces of chicken. Finely chop onion. Chop apple

cook bacon until crisp. Drain and crumble

Whisk vinegar, mustard, salt, and pepper. Whisk in oil

Combine 2T dressing with chicken and let sit 5 minutes.

Add walnuts, bacon, spinach, onion, apple, and remaining dressing. Toss