Cut Cauliflower in small florets, cube bell peppers, cut mushrooms in half and carrots and zucchini in circles. Do not cut very thin strips.
Make batter with all purpose flour, cornstarch(sold as cornflour inn India), garlic powder, bell pepper powder, red chilli powder and salt.
Use about ½ cup water first then as water 1-2 tbsp( if required) at a time to make lump free batter. The batter should be thick enough to coat the veggies. Do not make free flowing batter. It should be like the pakora/fritter batter.
Add a tsp of oil and make a smooth lump-free batter. Add and coat all the vegetables nicely in batter.
Preheat air fryer at 350F, then add the veggies when indicated. Air fry the veggies, it takes about 10 minutes.
Make the sauce mix. In a heavy bottomed pan, heat a tbsp of oil, add finely chopped garlic, sauté till it gives aroma and then add the sauce mix and freshly ground black pepper.
Cook for a minute then add the air fried vegetables and mix well with light hands. Coat all the veggies nicely in sauce.
Sprinkle Sesame Seeds and finely chopped spring onion greens and serve hot.