Add the vegan butter, white sugar and brown sugar to the bowl of a stand mixer and cream them together and then add in the vanilla and pumpkin purée.
Then add in the all purpose flour, baking powder, baking soda, cinnamon, nutmeg and salt and mix in by hand (don't use the electric mixer for this part).
It will make a thick cookie dough that is a bit wet, a little too wet to roll with your hands.
Preheat the oven to 350°F (180°C).
Scoop the cookie dough in roughly 2 Tbsp sized scoops out onto a parchment lined baking tray, aiming for around 20 cookies. Flatten with a fork.
Bake for 12-15 minutes. When you remove them from the oven they will be very soft. Let them cool on the tray before moving them.
Prepare your maple glaze by mixing up the powdered sugar, maple syrup, vanilla and 1 and ½ tablespoons soy milk in a bowl. If needed add the remaining half tablespoon of soy milk a little at a time until you get a consistency that is thin enough to drizzle but not so thin that it will run right off the cookies.
When the cookies have cooled use a teaspoon to drizzle the maple glaze over the cookies.