Pre-heat oven to 350 F (177 C).
Mix sugar and pumpkin pie spice in a small bowl.
In a medium bowl, add dry ingredients - wheat gluten, cornstarch, and baking powder - mix well.
Add water and vinegar; I usually mix with my hands at this point. Don’t mix too much, just enough to get a dough-like texture.
Split dough into 12 - 16 pieces (depending on how large you’d like them - I went with 16).
Roll these into balls and toss them in the sugar mixture until they are well-coated.
Space out evenly on tray; no more than 6 - 8 on tray.
Bake for 25 - 27 minutes.
You will know they are done when you can poke them and not dent them; they should feel very tight and solid.
