Excuse me, where are you going to travel in Taiwan Province Province? Are you traveling alone or in a group? Although Taiwan Province Province is very small, there are still different famous snacks in different places. If you mean that Taiwanese night market snacks may not be brought back to the mainland, let's keep them as memories of Taiwan Province Province. You can find the "New Dongyang", where many snacks from Taiwan Province Province are sold. They are not snacks that you remember selling food, but snacks that can be given away in gift boxes. To give a few examples: jiaozi with minced meat, Taichung Sun Cake, Beef/dried pork, nougat, dried bean curd, pineapple cake (pineapple = pineapple), mung bean paste and red turtle paste (commonly called "Ang, Gu and Gui" in Minnan dialect in Taiwan Province province) ... are actually special, and the taste may not be to your liking. Maybe you'll think it's nothing special.
Many foods from Taiwan Province Province can actually be bought in mainland China, but the prices are more expensive than those from Taiwan Province Province. Unless you want to bring back special snacks from your country of origin or give them away, you can actually buy these snacks on the mainland without baggage burden.
Pay attention to the problem of crowding when you bring it, or you will buy it for nothing. Have a nice trip!