For a richer flavor, use homemade mayonnaise. Alternatively, a high-quality store-bought mayonnaise will also work well. Adjust the amount of horseradish sauce to suit your taste preferences. Start with a smaller amount and add more as needed. To prevent the apple from browning, toss it with a squeeze of lemon juice before adding it to the salad. Serve this Autumn Chicken Salad on croissants, lettuce wraps, or crackers for a delightful lunch or light dinner.