In a bowl, layer the salad as follows: lettuce, red onion, celery, turkey bacon, peas, vegan cheddar, sunflower seeds, dried cherries. Cover with plastic wrap and set in the fridge until close to service. Up to 24 hours in advance.
Whisk together all the dressing ingredients and pour the dressing over the salad just before service. Toss to coat and serve chilled.