Place tin of sweetened condensed milk in slow cooker
Cover completely with water and cook on HIGH for 4.5 hours
Make sure water is about an inch above can and top with more water during cooking if you have to.
Allow to completely cool in water.
If the can when shaken sounds like milk, you will have to cook it more so just place back in and cook for longer.
Place gingernut biscuits on an upside down mini muffin tray and place in a 120 oven for around 5 minutes. You want the biscuits to be soft only not crispy
Shape over the tray and allow to cool.
*If you don't have a muffin tray, place on a tray to heat then make a dint using a spoon.
Whip thickened cream adding sugar and vanilla to taste.
Spoon caramel into biscuits then place cream on top.