For the best texture, dry the romaine very well so the dressing clings to the leaves instead of watering down. The dressing can be prepared up to a week in advance and stored in an airtight jar in the refrigerator. The chicken can be cooked ahead and served chilled or gently rewarmed before adding to the salad. To keep this salad strictly keto, skip traditional bread croutons and add extra Parmesan, bacon, or avocado for crunch and richness. If you prefer a thinner dressing, whisk in a splash of water or extra lemon juice until it reaches your desired consistency.