Millionaire’s shortbread is one of those British treats that manages to be wonderfully simple and completely indulgent at the same time. A buttery shortbread base is topped with a thick layer of soft, chewy caramel and finished with smooth chocolate.
Cut into little squares, the three distinct layers make these look impressive enough for a special occasion, but there’s nothing particularly complicated about making them at home.
If you’re baking in an American kitchen, I’ve included both US and metric measurements and a few tips for getting that all-important caramel layer just right.
What Is Millionaire’s Shortbread?
Millionaire’s shortbread is a layered British traybake made with three components:
Shortbread — a crisp, buttery biscuit base.
Caramel — a thick, rich layer made with butter, brown sugar and sweetened condensed milk.
Chocolate — a smooth layer of chocolate spread over the cooled caramel.
The name is thought to refer simply to how rich and luxurious the finished shortbread is compared with ordinary shortbread.
And rich it certainly is! These are best cut into relatively small squares — although whether you stop at one is another matter entirely.
Is Millionaire’s Shortbread British?
Millionaire’s shortbread is strongly associated with British baking and is especially familiar throughout the UK.
You may also hear similar layered bars called caramel shortbread, and in some places the terms are used interchangeably.
For American bakers, the easiest way to think of them is as buttery shortbread bars topped with homemade caramel and chocolate.
Millionaire’s Shortbread Ingredients
For the Shortbread
- 1¾ cups (220g) all-purpose flour
- ¾ cup (170g) unsalted butter, softened
- ⅓ cup (65g) granulated sugar
- ¼ teaspoon salt
For the Caramel
- ½ cup (113g) unsalted butter
- ½ cup packed (100g) light brown sugar
- 2 tablespoons (30ml) golden syrup
- 1 can (14 oz / 396g) sweetened condensed milk
- ½ teaspoon vanilla extract
- ¼ teaspoon salt
For the Chocolate Topping
- 8 oz (225g) semi-sweet chocolate, chopped
- 1 tablespoon (14g) unsalted butter
A Note About Golden Syrup
Golden syrup is a classic British pantry ingredient with a buttery, lightly caramelized flavour. It’s not the same thing as corn syrup, maple syrup or molasses.
It’s increasingly easy to find in the United States, particularly online and in stores with international food sections.
Brit & Skillet Tip: If golden syrup is new to you, take a look at my Golden Syrup in America: What to Buy and Where to Find It guide. I also have a Treacle vs. Molasses vs. Golden Syrup guide explaining the differences between these easily confused ingredients.
What Size Pan Should I Use?
An 8-inch (20cm) square baking pan works beautifully for this recipe and produces substantial, clearly defined layers.
Line the pan with parchment paper, leaving enough overhang on two sides to lift the entire slab from the pan once it has set.
A metal baking pan is ideal for getting the shortbread base evenly baked.
How to Make Millionaire’s Shortbread
1. Prepare the Pan
Preheat the oven to 350°F (175°C).
Lightly grease an 8-inch (20cm) square baking pan and line it with parchment paper.
2. Make the Shortbread
Place the softened butter and sugar in a mixing bowl and beat until combined and creamy.
Add the flour and salt and mix just until a soft, crumbly dough forms.
Press the dough evenly into the bottom of the prepared pan. Use the bottom of a measuring cup or glass to help create a flat, even layer.
Prick the surface lightly with a fork.
3. Bake the Shortbread
Bake for 20–25 minutes, or until the edges are lightly golden and the centre looks set.
Remove from the oven and allow the shortbread to cool while you prepare the caramel.
4. Make the Caramel
Place the butter, brown sugar, golden syrup, sweetened condensed milk and salt in a medium heavy-bottomed saucepan.
Heat gently over medium-low heat, stirring continuously, until the butter has melted and everything is combined.
Increase the heat slightly and bring the mixture to a gentle simmer.
Continue cooking for approximately 8–12 minutes, stirring constantly and scraping the bottom and corners of the pan so the caramel doesn’t catch.
The caramel should become noticeably thicker and deepen to a warm golden colour.
Remove from the heat and stir in the vanilla.
5. Add the Caramel Layer
Immediately pour the hot caramel over the baked shortbread.
Spread it carefully into an even layer.
Allow it to cool at room temperature for about 30 minutes, then refrigerate until the caramel is completely firm — approximately 1–2 hours.
6. Add the Chocolate
Place the chopped chocolate and butter in a heatproof bowl.
Melt gently in the microwave in short intervals, stirring between each one, or use a double boiler.
Once smooth, pour the chocolate over the chilled caramel and spread it evenly to the edges.
7. Let It Set
Allow the chocolate to begin setting at room temperature before refrigerating briefly until firm.
Try not to leave it in the refrigerator until the chocolate becomes extremely hard, as very cold chocolate is more likely to crack when you cut it.
8. Cut Into Squares
Use the parchment-paper overhang to lift the Millionaire’s shortbread from the pan.
For cleaner slices, use a large sharp knife warmed under hot water and thoroughly dried.
Gently score the chocolate first, then cut through the layers.
Cut into 16 squares for generous portions or smaller pieces if you prefer — these are wonderfully rich.
How Do I Know When the Caramel Is Ready?
The caramel is usually the part of Millionaire’s shortbread that makes people nervous, but there are a few signs to look for.
As it cooks, the mixture should become thicker, darker and more difficult to stir. When you drag your spoon or spatula across the bottom of the saucepan, you should briefly be able to see the bottom before the caramel flows back over it.
Don’t rush this stage by turning the heat too high. A slightly lower heat with constant stirring gives you much more control and reduces the chance of scorching.
Brit & Skillet Tip: Don’t walk away from the caramel — even for a minute. Sweetened condensed milk can catch on the bottom surprisingly quickly.
How to Stop the Chocolate From Cracking
One of the most common Millionaire’s shortbread problems happens right at the end: you make three beautiful layers and then the chocolate shatters when you try to cut it.
Adding a small amount of butter to the chocolate keeps the topping slightly softer.
It also helps to cut the bars before the chocolate becomes rock-hard.
If the chocolate has been refrigerated for several hours, let the slab sit at room temperature for a little while before cutting.
Can I Use Milk Chocolate?
Absolutely.
Semi-sweet chocolate provides a lovely contrast to the very sweet caramel, which is why I prefer it here. Dark chocolate is another excellent choice if you want something slightly less sweet.
Milk chocolate will produce a sweeter, more traditional confectionery-style result.
You can also combine milk and semi-sweet chocolate.
Brit & Skillet Tips for Perfect Millionaire’s Shortbread
Keep the shortbread simple. The base should be buttery and crisp enough to support the caramel without competing with it.
Cook the caramel patiently. Too little cooking can leave you with caramel that never sets properly; excessive heat can scorch it.
Stir constantly. Pay particular attention to the corners and bottom of the saucepan.
Let each layer set. Trying to add chocolate before the caramel has firmed can spoil those lovely distinct layers.
Don’t over-chill before slicing. Slightly softened chocolate is much easier to cut cleanly.
Use a hot, dry knife. Wiping the blade between cuts helps produce the neat bakery-style squares.
Why Did My Caramel Stay Soft?
If the caramel remains runny after chilling, it was probably not cooked long enough.
The mixture needs enough time on the stove for some moisture to evaporate and for the caramel to thicken.
Cooking times can vary slightly depending on your saucepan and stove, so use the appearance and texture of the caramel as well as the clock.
Why Is My Caramel Too Hard?
Caramel that becomes very hard or chewy has generally been cooked too long or at too high a temperature.
Keep the mixture at a controlled simmer rather than a vigorous boil and remove it from the heat once it has noticeably thickened and developed a rich golden colour.
How to Store Millionaire’s Shortbread
Store Millionaire’s shortbread in an airtight container.
In a reasonably cool kitchen, it can be kept at room temperature for around 3–4 days.
If your kitchen is warm enough that the chocolate becomes soft, refrigerate the bars instead. Let refrigerated pieces sit at room temperature for a few minutes before serving for the best texture.
Can You Freeze Millionaire’s Shortbread?
Yes.
Once completely set, cut the shortbread into individual squares and place them in an airtight freezer-safe container with parchment paper between the layers.
Freeze for up to 2 months.
Allow the pieces to thaw in the refrigerator or at room temperature before serving.
What to Serve With Millionaire’s Shortbread
Millionaire’s shortbread doesn’t need much accompaniment — it’s quite capable of stealing the show all by itself.
A square alongside a cup of tea or coffee is perfect.
For a British-style afternoon spread, serve it alongside other favourites such as Traditional British Jam Tarts or Classic British Scones.
And if you’re looking for more bakes to try, you’ll find plenty more in the Brit & Skillet Recipes collection.
A Little Taste of Britain
There’s something particularly satisfying about cutting into a tray of Millionaire’s shortbread and seeing those three distinct layers: buttery shortbread, golden caramel and glossy chocolate.
It may look like something from a bakery counter, but once you break it into those three simple stages, it’s surprisingly approachable to make at home.
Just remember the most important rule: keep an eye on that caramel!
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