For best texture, use slightly underripe but still creamy avocado, which holds up better over 2 to 3 days of storage and browns more slowly. If you are very sensitive to carbs from onion, use green onion and keep the total onion to a small amount to stay strict keto. Always keep the egg salad well chilled and do not leave it at room temperature for more than 2 hours for food safety. To save time on busy weeks, you can start with pre-cooked hard-boiled eggs and assemble the salad in minutes.