Preheat oven to 180℃.
In a bowl, combine the rapeseed oil, sugar, aquafaba, vanilla extract and milk.
Mix the dry ingredients together and beat into the wet mixture and mix until a smooth batter forms.
Fold in the Biscoff spread.
Pour into a greased doughnut mould baking tin and bake for around 10 minutes or when a knife comes out clean.
Allow to cool.
For the frosting, whisk together the aquafaba and cream of tartar on high speed for 8 minutes until stiff white peaks form.
Slowly add the icing sugar and the vanilla extract until peaks become glossy (another 5-7 minutes).
Spread on top of the doughnuts.
Sprinkle with crushed Biscoff cookies and drizzle with spread.