Preheat over to 350℉. Grease muffin tin, or mini silicone bunt cake molds.
Add all the dry ingredients to a bowl and mix [1 ¼ c flour, 1 tbsp cornstarch, ½ tsp baking soda, 1 tsp baking powder, ½ tsp sea salt, 2 tsp cinnamon, ½ tsp allspice, ⅔ c coconut sugar].
Add all the wet ingredients to a different bowl and mix [1 c oat milk, 1 ½ tsp vanilla extract, ½ c pumpkin puree, ¼ c sunflower oil, ¼ c maple syrup].
Slowly add the wet ingredients to the bowl of dry ingredients, mixing thoroughly throughout.
Pour cake batter into the muffin tin or moulds and place in the oven for about 20-30 mins.
To make the icing combine all of the ingredients in bowl and mix [½ c powdered sugar, 2 tbsp maple syrup, 2 tsp vegan margarine, 1 tbsp pumpkin puree, ½ tsp vanilla, pinch of cinnamon and salt].