Millionaire Shortbread
If you have never made millionaire shortbread, let me introduce you to one of the most satisfying bars that can come out of your oven. It has three layers: a buttery shortbread crust, a soft caramel filling, and a smooth chocolate ganache topping.
A light sprinkle of flaky sea salt over the chocolate finishes everything and gives you that salty sweet contrast I cannot resist.
The name comes from how rich these bars are. There is nothing shy about them. One square goes a long way, which is exactly why I love bringing them to parties, potlucks, and holiday trays.
The best part is that each layer is easy to make on its own. You are not juggling complicated techniques. You make the crust, cook the caramel, then melt chocolate for the ganache, and the whole thing comes together in one 9×13 inch pan.
These bars can also be made days ahead of serving, so you can do the work when you actually have time and simply slice them when guests arrive. One pan gives you 24 servings, which makes this a smart choice for a crowd.
Plan on about 45 minutes of hands on prep, 4 hours of cooling and chilling, and 23 to 28 minutes of baking for the crust. From start to finish that is roughly 4 hours 45 minutes, and most of it is simply waiting.
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Recipe Ingredients
Three layers sounds like a long shopping list, but it is not. The ingredient list is short and straightforward, and I recommend using exactly what the recipe calls for. Every item has a job, and a swap in one layer can change the texture of the whole bar.
For the shortbread crust, you will need 1 cup of softened unsalted butter, 1/2 cup of granulated sugar, 2 large egg yolks at room temperature, 1/4 teaspoon of salt, and 2 cups of all purpose flour, spooned and leveled.
The egg yolks are there to keep the shortbread soft, so please do not skip them. Room temperature matters too. If you forgot to set the eggs out ahead of time, place them in a bowl of warm water for 10 minutes and you are good to go.
For the caramel, gather 2 cans of sweetened condensed milk (14 ounces each), 1 1/4 cups of packed light brown sugar, 3/4 cup of sliced unsalted butter, 1/4 cup of light corn syrup, 1 teaspoon of pure vanilla extract, and 1/4 teaspoon of salt.
One important note here. Use sweetened condensed milk, not evaporated milk. Sweetened condensed milk is sweeter and thicker, and that is exactly what the caramel needs to set up properly.
For the ganache, you need 8 ounces of semi sweet chocolate bars, finely chopped, and 1/3 cup of heavy whipping cream. Sea salt for sprinkling on top is optional, but I recommend it.
Please reach for real chocolate bars rather than chocolate chips. Chips contain stabilizers that keep them from melting as smoothly, so bars give you a glossier, silkier topping. Two bars, brands like Bakers or Ghirardelli, work beautifully here.
The heavy whipping cream gets heated with the chocolate, and it must be at least 36 percent fat. Regular milk or half and half will not work for the ganache, and it will not set the way you want it to.
Since these bars are very sweet, that little pinch of flaky sea salt on top is not just decoration. It balances the sweetness and makes the chocolate taste even more like chocolate.
How to Make Millionaire Shortbread
The order matters here: shortbread crust first, then caramel, then chocolate ganache, with cooling time between the layers. Give yourself enough time and this recipe is genuinely relaxed to make.
Here is the whole process at a glance before we walk through it step by step.
| Layer | What you do | Time |
|---|---|---|
| Shortbread crust | Mix, press into the pan, and bake at 350°F (180°C) | 23 to 28 minutes, then cool completely |
| Caramel | Boil and whisk until thickened and caramel colored | 8 to 13 minutes, then chill 1 hour |
| Ganache | Melt chocolate with cream, spread, and sprinkle with sea salt | Chill 1 to 2 hours |
Step 1: Make the shortbread crust. Preheat the oven to 350°F (180°C). Line a 9×13 inch baking pan with parchment paper and leave some overhang so you can lift the bars out later.
In the bowl of a stand mixer fitted with the paddle attachment, or in a large bowl using a hand mixer, beat the softened butter and sugar until well combined, about 2 minutes. You want them combined, not fluffy.
Mix in the egg yolks and salt until fully combined, stopping to scrape down the sides of the bowl as needed. Add the flour and mix on low speed just until the mixture starts to come together but is still crumbly. That crumbly texture is exactly right, so do not keep mixing in hopes of a smooth dough.
Scoop the mixture into the prepared pan and press it down into one even layer. The bottom of a measuring cup helps here if you want a really level crust.
Bake for 23 to 28 minutes, until the top is set and the edges are lightly golden brown. Then set the pan aside to cool completely on a wire rack. If you are in a hurry, place the pan in the refrigerator on a wire rack to speed up the cooling.
Step 2: Make the caramel. In a large saucepan, combine the sweetened condensed milk, brown sugar, sliced butter, and corn syrup. Place it over medium heat and whisk frequently until it comes to a boil.
Keep cooking for 8 to 13 minutes, whisking constantly, until the mixture thickens, starts to pull away from the sides of the pan, and turns a caramel color. I wear an oven mitt while whisking to protect my hand from hot splatters, and I suggest you do the same.
Not sure whether it is ready? Fill a glass with cold water and drop in a small spoonful of caramel. If you can form a soft ball with it, the caramel is done. If you cannot, keep cooking and test again in a minute or two.
Remove the saucepan from the heat and stir in the vanilla extract and salt until fully combined. Pour the caramel over the cooled shortbread crust and spread it into one even layer. Refrigerate for 1 hour, or until the caramel is mostly set.
Step 3: Make the ganache. Combine the chopped chocolate and heavy whipping cream in a large heatproof bowl. Microwave in 20 second increments, stirring well after each one, until the chocolate is completely melted and smooth.
Take the pan out of the refrigerator, pour the ganache on top, and spread it around into one even layer. Sprinkle the top with sea salt.
Return the pan to the refrigerator and chill for 1 to 2 hours, until the chocolate is set and firm. Lift the bars out using the parchment overhang, slice into pieces, and serve.
A sharp knife and a little patience give you the cleanest slices. I like to wipe the blade between cuts, and the bars slice most neatly straight from the refrigerator.
Storage & Freezing Instructions
These bars store beautifully, which is another reason they are a favorite for planning ahead. Keep them in an airtight container on the counter or in the refrigerator for up to four days.
In a warm environment, I recommend the refrigerator so the ganache topping does not soften. They taste just as good cold, so nothing is lost.
They also freeze well for up to three months. Thaw them overnight in the refrigerator before eating, and the layers come back beautifully.
Baking Tips
Wear an oven mitt while cooking the caramel. That mixture bubbles and spits, and a mitt saves your hand from hot splatters.
Caramel needs constant stirring, so set a timer and stay at the pot. It is done when it has thickened, turned a caramel color (almost like butterscotch pudding), and started to pull away from the sides of the pan.
For the best ganache, use regular chocolate bars and full fat heavy whipping cream. Lower fat options such as half and half or milk will prevent it from setting properly, and you will end up with a soft topping that never firms up.
If this is your first time making these, you are in for a treat. Just be careful not to overbake the shortbread crust, or it may crumble when you cut the bars.
More Cookie Bars You’ll Love!
If you enjoy layered bars, there are plenty more to bake next. Try Chocolate Chip Cookie Bars, Magic Cookie Bars, Classic Blondies, Peanut Butter Chocolate Chip Bars, and Carmelitas for your next tray of sweets.
By the way, the shortbread crust in this recipe is adapted from a homemade lemon bars recipe, which is why it turns out so tender and buttery.
FAQs
What is the secret to a soft and gooey caramel filling for millionaire shortbread?
The key to a soft, gooey caramel is cooking the mixture to the soft-ball stage, between 236°F and 240°F. Combine sweetened condensed milk, packed light brown sugar, sliced unsalted butter, and light corn syrup in a large saucepan. Bring it to a boil over medium heat and whisk constantly for 8 to 13 minutes until it thickens, turns a caramel color, and pulls away from the sides of the pan.
Why should I use semi-sweet chocolate bars instead of chocolate chips for the ganache topping?
Semi-sweet chocolate bars are recommended because they contain a higher cocoa butter content than most chocolate chips. Chocolate chips often contain stabilizers that prevent them from melting as smoothly, resulting in a less glossy and stable ganache. For the best results, use 8 ounces of finely chopped semi-sweet chocolate bars.
Can I make millionaire shortbread ahead of time and freeze it?
Yes, millionaire shortbread freezes beautifully for up to 3 months. Once the bars are fully set and sliced, layer them in an airtight container with parchment paper between layers. To serve, thaw them overnight in the refrigerator for the best texture.
How do I get clean, neat slices of millionaire shortbread?
For clean slices, use a long, sharp knife and wipe it clean between each cut. For easier slicing, warm the knife slightly under hot water and dry it before cutting. This helps the blade glide through the chocolate and caramel layers without dragging or cracking the ganache.
Millionaire Shortbread
Millionaire Shortbread If you have never made millionaire shortbread, let me introduce you to one of the most satisfying bars that can come out of your oven. It has three layers: a buttery shortbread crust, a soft caramel filling, and a smooth chocolate ganache topping.
- Total Time: 285 min
- Yield: 24 bars 1x
Ingredients
For the shortbread crust
1 cup unsalted butter, softened
1/2 cup granulated sugar
2 large egg yolks, at room temperature
1/4 teaspoon salt
2 cups all-purpose flour, spooned & leveled
For the caramel
2 (14-ounce) cans sweetened condensed milk, NOT evaporated milk
1 1/4 cups packed light brown sugar
3/4 cup unsalted butter, sliced
1/4 cup light corn syrup
1 teaspoon pure vanilla extract
1/4 teaspoon salt
For the ganache
8 ounces semi-sweet chocolate bars, finely chopped
1/3 cup heavy whipping cream
Sea salt, for sprinkling on top
Instructions
To make the shortbread crust
1-Preheat the oven to 350°F (180°C): Preheat the oven to 350°F (180°C). Line a 9×13-inch baking pan with parchment paper, making sure to leave some overhang for easy removal, and set aside.
2-In the bowl of a stand mixer: In the bowl of a stand mixer fitted with the paddle attachment or in a large mixing bowl using a handheld mixer, beat the butter and sugar until well combined, about 2 minutes.
3-Mix in the egg yolks and salt: Mix in the egg yolks and salt until fully combined, stopping to scrape down the sides of the bowl as needed.
4-Add the flour and continue mixing on: Add the flour and continue mixing on low speed until the mixture starts to come together, but is still crumbly.
5-Scoop the crumbly mixture into the prepared: Scoop the crumbly mixture into the prepared baking pan and press it down into one even layer.
6-Bake for 23 to 28 minutes, or: Bake for 23 to 28 minutes, or until the top is set and the edges are lightly golden brown. Remove from the oven and set aside to cool completely on a wire rack. If needed, you can place it in the refrigerator on a wire rack to speed up the cooling process.
To make the caramel
7-In a large saucepan, combine the sweetened: In a large saucepan, combine the sweetened condensed milk, brown sugar, sliced butter, and corn syrup.
8-Place over medium heat, whisking frequently until: Place over medium heat, whisking frequently until it comes to a boil. Continue cooking for 8 to 13 minutes, whisking constantly, until the mixture thickens, starts to pull away from the sides of the pan, and turns a caramel color. I recommend wearing an oven mitt while you are whisking the mixture to avoid any hot splatters. You can test the mixture to make sure it’s done by filling a glass with cold water and dropping a small spoonful of caramel into it. If you can form a soft ball with the mixture, then it’s ready. If you can’t, keep on cooking the caramel.
9-Remove from the heat and stir in: Remove from the heat and stir in the vanilla extract and salt until fully combined.
10-Pour the caramel over the cooled shortbread: Pour the caramel over the cooled shortbread crust and spread it around into one even layer. Refrigerate for 1 hour or until the caramel is mostly set.
To make the ganache
11-Combine the chopped chocolate and heavy whipping: Combine the chopped chocolate and heavy whipping cream in a large heat-proof bowl. Microwave in 20-second increments, stirring well after each increment, until the chocolate is completely melted and smooth.
12-Remove the pan from the refrigerator, pour: Remove the pan from the refrigerator, pour the chocolate ganache on top, and spread around into one even layer. Sprinkle the top with sea salt.
13-Return to the refrigerator and chill for: Return to the refrigerator and chill for 1 to 2 hours or until the chocolate is set and firm.
14-Lift the bars out of the pan: Lift the bars out of the pan using the overhang from the parchment paper, slice into pieces, and serve.
Last Step:
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- Method: bake
