Let it boil for 7-8 minutes and keep stirring. You will notice the syrup getting thicker. This means the syrup is ready to use. Be very careful and try not to over cook. Keep it on medium heat.
Once the syrup is ready, remove from heat. Add milk powder and ghee into the saucepan. Keep mixing to make a silky dough. (If the mixture is runny add a few more tablespoons of milk powder).
Add in the Biscoff spread and keep stirring.
Transfer mixture into a greased (with ghee) steel plate.
Spread the soft dough over the greased plate and smooth it out until evenly – set aside.
In a small saucepan, melt some Biscoff spread until silky and runny. Drizzle over the barfi dough and sprinkle some crushed Biscoff (OPTIONAL)
Leave overnight in the fridge and cling film the top of the steel plate carefully.