Cook popcorn according to the packet instructions and place into a large bowl.
Place the brown sugar, butter, honey and salt into the TM bowl. Mix for 4 minutes, 70 degrees, Speed 2. Scrape down the sides of the bowl.
Mix for 8 minutes, Varoma, Speed 2.
Pour the caramel sauce over the popcorn and use a spoon to stir it through until all of the popcorn is completely covered (if using chopped nuts, add them in before stirring).
Spoon the mixture into one even layer onto a baking paper lined tray. Set aside to cool completely.
Once completely cooled, break the popcorn into pieces and store in an airtight container.
* Note: you can mix the popcorn with the caramel sauce in the Thermomix on Reverse Speed 1, however I find it easier to stir it in a separate bowl - and the pieces stay together better too!