I love this way of dusting veg and tofu in cornstarch and roasting at high heat. You use less oil and it requires less effort. While it roasts, you can get on with making the sauce. Then you just toss everything together and eat with rice. (You could also use an airfryer)
You could substitute the eggplant with another veg like cauliflower or broccoli.
Cornstarch (cornflour) is foundational to Cantonese cooking, so it is always my chosen starch, but you could also use potato starch if that’s what you have.