My partner just made some fried rice with leftover potato chunks and mapo sauce and holy shit this is so good. We've also made di san xian a couple times and a veganized lychee pork and every time the potatoes have been fantastic, that gooey starchy surface cooked potatoes get is such a powerful sauce sponge. white people love potatoes, i don't get why the standard western Chinese takeout menu didn't seem to adapt any potato dishes
If you asked me for a Chinese potato dish off the top of my head I would say 地三鲜 (potato, eggplant, pepper), followed by julienned potato salad. The first one is very popular in the Northeast, but as most Chinese restaurants in the west base their dishes off of Southern Chinese cuisine, this is not very common. The second dish is popular everywhere but I only see more authentic Chinese places serve it, I doubt the average americanized Chinese takeouts would have it (and idk if their usual customers even know what 凉菜 is).
Other than that there's potato stir fry and varying kinds of potato stew, but potatoes don't feature all that prominently in Chinese cuisine except regionally.