Grease a small rectangular slice tray and line with baking paper (allowing the edges to overlap).
Place the biscuits into the Thermomix bowl and crush on Turbo for 1-2 seconds or until slightly chunky (use your hands to break up any larger chunks). Set aside and wipe the bowl.
Place the white chocolate into the Thermomix bowl and grate on 10 seconds, Speed 5. Scrape down the sides of the bowl.
Add the chopped butter and sweetened condensed milk. Melt for 3 minutes, 50 degrees, Speed 3 (or until melted) - scrape down the sides of the bowl occasionally.
Add the pistachios, cranberries and chopped biscuits to the Thermomix bowl. Mix together on Reverse, Speed 1 for 10-15 seconds or until completely combined (use the spatula to assist).
Spread the mixture into the tray and place into the fridge for a minimum of 3 hours.
Crushing the biscuits – press Turbo just once or twice (for 1 second) and then break up any remaining large chunks with your hands. The Thermomix likes to turn your biscuits into powder if you’re not careful!
Use full fat condensed milk as it sets firmer than skim.
Grease and line a baking tray with baking paper to allow for easy removal of the slice.
You can substitute the pistachios and cranberries with any alternative dried fruits and nuts you like.
Store in an airtight container in the fridge for up to 1 week.
Freeze in an airtight container for up to 1 month.
The biscuits will soften after defrosting the slice.