Preheat oven to 160 degrees celsius (fan-forced). Grease and line a 28cm x 20cm rectangular slice tin with baking paper.
Place the coconut oil, honey and peanut butter into the Thermomix bowl. Melt or 2 minutes, 90 degrees, Speed 2 (or until melted).
Add the cinnamon, vanilla extract, salt and brown sugar and mix for 5 seconds, Speed 4.
Add the rolled oats, coconut, trail mix, plain flour and puffed rice. Mix for 10 seconds, REVERSE, Speed 2. Scrape down the sides of the bowl and repeat. Allow to cool slightly.
Add the chocolate chips and mix with the spatula to combine.
Pour the mixture into the prepared tray and press down firmly and evenly.
Bake for 25-30 minutes or until just golden. Allow to cool completely before cutting into slices.