Line the base and sides of a slice tin with baking paper – making sure you leave the paper hanging over the edges.
Place the rice malt syrup and peanut butter into the Thermomix bowl and cook for 1 minute on 80 degrees, Speed 1 or until melted and combined. After approximately 30 seconds, use the spatula to scrape down the sides.
Add the rice bubbles to the bowl and mix for 1 minute 20 seconds on Speed 1, Reverse, until mixture has combined.
Pour the combined mixture into a slice tin and use a metal spoon to spread across the tin and push down.
Break the chocolate into the Thermomix bowl and melt with the vegetable on Speed 2, 50 degrees for 4 minutes.
Pour the melted chocolate over the top of the slice and place in the fridge for an hour or until set.
Once set, remove the slice from the fridge and cut into small squares.