Millionaire’s shortbread is one of my very favourite little treats. It’s easy to make and it’s wickedly rich, so it’s perfect served in small bite size squares. I am a big fan of salted caramel so I’ve been making salted caramel millionaire’s shortbread with sea salt for a while now. The sea salt cuts the richness of the shortbread and the bitterness of the dark chocolate balances it perfectly.



  1. Preheat your oven to 180°c. Grease an 8” loose bottom square baking tin and line with baking parchment. If you don’t have a loose bottomed one, line with lots of parchment so that you will be able to lift the whole lot out of the pan when cold. If you’ve got flappy bits of parchment, use clothes pegs to pin them to the sides.
  2. With a freestanding or a handheld mixer, beat the butter and the sugar together until smooth. Don’t overbeat though or your biscuits will go a bit *too* airy. About 1-2 mins on medium should do make it light but not overly fluffy.
  3. Turn the mixer to a slower speed and slowly add the sieved flour. It will turn into a dough fairly quickly. If it doesn’t look like it’s about to go, then leave it mixing for a good 3 mins and it should come together.
  4. Remove the dough from the mixer and press into your buttered, lined tin. Smooth out with the palms of your hands and prick all over with a fork. Pop in the oven for 15-20 mins until it is lightly golden. Don’t overcook it.
  5. While the shortbread is cooking. Pop your caramel into a small non stick pan and warm on a low heat. Whisk until smooth and then add the sugar and butter. Whisk together until the mixture is smooth and keep mixing as it starts to bubble.
  6. Now, mixing very very regularly, simmer the caramel for about 15-20 mins. You will need to be patient as it takes quite a long time to achieve the right thickness. If you take it off too quickly, the caramel won’t set properly. At the same time, if you cook it too long, it will go hard. It’s a bit of a gamble, but 15-20 mins on a low heat should get there.
  7. After 10 mins, sprinkle in some of the sea salt. I add this to taste, but caramel is very very hot, so I usually dip in a tea spoon, set it on the side for a few mins, then taste when it’s cool. The sea salt content is very much a personal taste – I usually use about a tbsp but you might want less.
  8. When the shortbread is out and the caramel has gotten to a nice, thick consistency, leave them both to cool for 45 mins or so.
  9. When they are cool (or mostly cool), spread the caramel over the biscuit base (don’t remove it from the tin yet) and then pop in the fridge for an hour to cool and set.
  10. When it’s firm, melt your dark chocolate (either in a double boiler or in the microwave (but only if you watch it like a hawk!) and spread evenly over the caramel. Pop back into the fridge and wait until the chocolate hardens.
  11. When it’s all set, use your loose bottom or your parchment to lift the whole lot carefully out of the tin.
  12. Pop a sharp knife in a mug of boiling water to warm. This is a trick Clare from Little Bear Cakery taught me! Then, wipe the knife off and gently pressure the chocolate until the knife melts through and you can cut it. If you do it cold your chocolate will crack. If aesthetics aren’t important to you then by all means hack away, but I find the hot knife method makes very nice even little squares, if you can be patient enough to do it. :)
  13. Enjoy with a nice cup of tea, or a cheeky glass of wine!