Sweet potato chews?

My toddler is obsessed with these dried sweet potatoes snacks I found like the brand Yammy. The only ingredient is dried sweet potato, but they have this chewy, sticky fudgy texture to them. I tried to make them myself by steaming sweet potato and then dehydrating a bit, but they’re just drying into hard sticks rather than becoming sticky and chewy. Any ideas what I’m doing wrong?! I’d love to be able to DIY these since they’re very expensive.