Combine milk and vinegar and set in the refrigerator, to form dairy-free buttermilk and preheat oven to 355°
In a mixing bowl whisk together dry ingredients (flour, baking powder, salt, brown sugar)
Next, remove buttermilk from the refrigerator, and in the same bowl add in wet ingredients (buttermilk, melted butter, egg alternative, and vanilla) whisk until combined
Once donut dough is finished, scoop dough into a large freezer or piping bag
Begin piping dough into a greased donut pan filling each donut-round halfway and bake in the oven for 15-18mins until fully baked
While donuts are baking begin making donut glaze whisking together powder sugar, milk, and Biscoff spread into an icing like consistency
Removed donuts from pan and place on a baking rack to cool
While donuts are cooling crumble 5 Biscoff cookies and set crumbs aside
Begin to dress donuts by coating each donut with Biscoff icing glaze and top with cookie crumbles and a Biscoff cookie and serve