Preheat your oven to 350°.
In a medium bowl whisk together the flour, granulated sugar, baking powder, salt, cinnamon and nutmeg.
In another medium bowl, mix together the pumpkin, almond milk, coconut oil and vanilla.
Add the wet ingredients into the dry ingredients. Stir together until completely incorporated.
Pour the cake batter into your un-greased baking dish and spread out into an even layer.
In a small bowl, whisk dark brown sugar with hot water and pour over the pumpkin cake batter Let the sugar syrup sit on top without stirring it in.
Carefully slide the baking dish onto the middle rack of oven and bake for 35-40 minutes.
Let cake cool for 10 minutes. Sprinkle on some confectioner's sugar and dig in.