I like the mix of veggies in this recipe, but you can definitely change it up. I would avoid mixing firm and soft veggies as they have different cooking times. Other vegetables I've tried include broccoli, cauliflower, green beans and celery. Broccoli will air fry a little quicker, so if you add it, you'll need to remove it before the other veggies are cooked. If you're using a firm mix of veggies, like root vegetables, you'll definitely need to increase the air frying time.