Boil the pumpkin and then puree it. Because it is so soft, you can also mash it with a fork. Peeling is not necessary. In Hokkaido, cooking makes the shell very soft.
Mix all dry ingredients. Then add the oil, soy milk and the pumpkin puree and mix into a dough. Put in muffin cups. The dough makes 15-20 pieces for me. Bake in the preheated oven for about 25 minutes at 180 ° C top / bottom heat.