Crush biscuits into quarters. Set aside.
Prepare a cake pan by lining it with parchment paper. I used a 21cm x 9cm loaf pan.
In a medium wok, add milo, cocoa powder, condensed milk, eggs, butter, vanilla, and water. Melt over low heat.
Once everything has melted and it thickens to the consistency of hot fudge, add crushed biscuits.
Mix well for 2-3 minutes. Once done, pour into the prepared loaf pan. Flatten top and chill for an hour.
Melt chocolate in a microwaveable bowl. Once melted, add room-temperature whipping cream and give this ganache a good mix.
Pour ganache over cake. Let this refrigerate for a few hours or overnight.