Pre-heat your oven to 160C Fan/180C/350F/Gas Mark 4, and line a cupcake tin with cupcake cases
In a mixing bowl whisk together the vegetable oil and Biscoff, then add the milk and vinegar and whisk in
In another mixing bowl, stir together the light brown sugar, self raising flour and baking powder
Make a well in the centre of the flour mixture, and pour in the oil and milk mixture, whisk them together gently with a hand whisk until smooth
Divide the mixture between the 12 cupcake cases, I find it easier to pour the batter into a jug to do this
Bake them for 20-25 minutes or until they are golden brown and a skewer inserted in the centre of the cupcakes comes out clean. Leave to cool completely
Make the buttercream by mixing the dairy free butter on it's own for a few minutes, then add the Biscoff spread, the icing sugar and milk, and mix until smooth. You can do this by hand or for best results use an electric whisk or a stand mixer with the paddle attachment
Spread or pipe the buttercream on top of the cupcakes and add a Lotus biscuit on each one, then sprinkle the crushed biscuit over all of the cupcakes
The biscuits will go soft after several hours in contact with the buttercream so add them later if you're not serving the cupcakes straight away
Store in an airtight container in a cool place and eat within 3 days