Line the base and sides of an 20cm x 20cm square baking tray with baking paper.
Place the chocolate and coconut oil (optional) into a clean and dry Thermomix bowl. Melt for 3-4 minutes, 50 degrees, Speed 2 or until melted.
Add the marshmallows, coconut, raspberry lollies and peanuts and mix for 5-10 seconds, Reverse, Speed 3 (using the spatula to help mix), or until completely combined.
Spread the mixture into the prepared baking tray and place in the fridge for 2 hours or until completely set.
Use a sharp knife to cut into slices (if you are having trouble cutting the slice, run your knife under hot water and then dry completely before cutting - the heat will help to cut the slice evenly).