Place room temperature butter and caster sugar into the Thermomix bowl. Cream 45 seconds, Speed 5 (scrape down the sides after 20 seconds).
Add the condensed milk and mix for a further 20 seconds, Speed 5.
Add the self-raising flour and Milo and mix for 20 seconds, Speed 6. Scrape down the sides of the bowl and repeat for a further 5-10 seconds or until completely combined.
Roll into teaspoon-sized balls and place onto the prepared baking trays. Press down lightly with a fork.
Bake for 10 minutes. Allow to cool for 10 minutes on the baking trays before transferring to a wire rack to cool completely.
Notes
RECIPE NOTES & TIPS
Soften the butter to room temperature before using
Use full fat (not skim) sweetened condensed milk
use Milo or any malted milk powder
Use a fork to press down the cookie dough balls before baking
Bake for 10 minutes (the biscuits will continue to firm up upon cooling)
Store in an airtight container at room temperature for up to 1 week
Freeze the uncooked dough or baked cookies for up to 3 months