Cut vegetables in similar sizes so that they cook evenly.
Use any vegetables in your pantry especially those with similar cooking times. I have used peppers, broccoli, cauliflower, zucchini and carrots. You can also use mushrooms, onion, squash etc.
You can make large batches of air fried veggies. Reheat them and consume after storing in the fridge. They stay good.
You can skip the oil in the recipe and just use water or vegetable broth in its place. Your veggies will not look as golden or plump but will taste good.
Air fry to your taste. I like the veggies to be well cooked but with a crunch and crispy on the edges.
You can vary the seasonings as per your like. Use more of pepper and cayenne if you like them hotter.