If using chicken thighs, pat dry and season with a pinch of salt and pepper. Follow same instructions as steak strips in Step 4, stirring occasionally until chicken reaches minimum internal temperature, 5-7 minutes.
If using bacon, line a plate with a paper towel. Place a medium non-stick pan over medium heat and add bacon to hot pan. Flip occasionally until crisp, 6-8 minutes. Transfer to towel-lined plate to remove excess oil. Top sandwich with bacon.