Make the recipe and lightly prick with a fork and bake for about 20 minutes. Set aside to cool.
Make the Caramel
Put the butter, sugar, Golden Syrup and condensed milk in a heavy bottomed pan and heat to bubbling, then simmer, stirring constantly, until thick and golden brown in color. If you have a candy thermometer, bring it to the soft ball stage 235-240F (113-115C). Otherwise, test a drop in a cold glass of water, and when it forms a soft ball, it's ready.
Pour caramel over cooled shortbread, and set aside to cool.
Finish the Millionaire Shortbread Bars
When the caramel has set, melt the chocolate (I put it in the microwave on "defrost") and spread it evenly over the top of the caramel layer.
Refrigerate before cutting into slices, and store in an airtight tin or freeze.
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