Place condensed milk, brown sugar, glucose syrup and butter in a saucepan over a low heat. Cook stirring, without boiling for 10 mins or until mix is glossy and the sugar is dissolved.
Increase heat to medium low and bring to a simmer, still stirring. Cook, while stirring for 6-8 minutes or until mixture thickens and comes away from the side of the saucepan. Remove from heat.
Stir in chocolate and hand crushed wagon wheels until chocolate is melted.
Spoon into a lined, rectangular baking tray and cover with cling wrap and refrigerate until set - normally takes a couple of hours.
Nutritional information is an estimate and provided as a courtesy. The values may vary according to the ingredients and tools that are used. Please use your preferred nutritional calculator for more detailed information.