NOTES Make sure you line your baking dish and leave an overhang so it's easy to remove.
Make sure you use room temperature butter it's essential for making the shortbread!
When making the caramel make sure to stir it constantly so it doesn't burn on the bottom.
You can use less chocolate on top if you'd prefer a thinner layer. Make sure to chill the caramel layer before adding the chocolate or there's a chance they will mix together and you won't have even layers.
Sea salt really enhances the chocolate flavor so try not to skip it.
I find it easier to cut the bars when they are chilled - try sawing the choc first so youdon't get broken pieces.