Prep Time: 30 minutes | Cook Time: 35 minutes | Chill Time: 2 hours | Total Time: 3 hours 5 minutes
Recipe Intensity & Details
Before you begin, here is a snapshot of what to expect regarding the difficulty and time commitment for this recipe.
Intensity Level: Intermediate
Why: While the steps are straightforward, this recipe requires juggling three distinct layers (shortbread, caramel, chocolate) simultaneously. The caramel demands patience and a watchful eye to prevent burning or crystallizing. However, the results are well worth the focused effort.
Active Time: 45 minutes (This includes measuring, making the shortbread, and preparing the caramel while the base bakes).
Passive Time: 2 hours 20 minutes (This includes baking the shortbread and, most importantly, allowing the layers to set in the refrigerator).
Makes: 16 large bars or 24 small squares.
Why You’ll Love This Recipe
Millionaire Shortbread—also known as Caramel Squares or Carmelitas—is the holy grail of tray bakes. It combines three perfect textures: a buttery, melt-in-your-mouth shortbread crust, a thick, gooey, salted caramel center, and a smooth, snappy chocolate top.
Forget store-bought versions. Homemade Millionaire Shortbread tastes infinitely better, and this recipe is engineered for success. We use a “no-fail” caramel method that doesn’t require a candy thermometer (though we recommend one for confidence) and a shortbread crust that stays firm under the weight of the toppings. This is the ultimate dessert for holidays, bake sales, or when you simply want to impress.
Ingredients
For the Shortbread Crust
1 ½ cups (190g) all-purpose flour – Provides the structure for the base.
½ cup (100g) granulated sugar – Adds a subtle sweetness to balance the rich toppings.
½ teaspoon salt – Enhances the butter flavor.
¾ cup (170g) unsalted butter, cold and cut into cubes – The key to a tender, crumbly shortbread. Cold butter is crucial.
For the Salted Caramel Filling
1 (14-ounce / 397g) can sweetened condensed milk – The base of our easy caramel.
½ cup (100g) light brown sugar, packed – Adds depth and a slight molasses flavor.
½ cup (113g) unsalted butter, cut into pieces – Provides richness and a smooth texture.
¼ cup (60ml) light corn syrup or golden syrup – This is the “secret ingredient” that prevents the caramel from crystallizing and ensures a silky-smooth texture.
1 teaspoon vanilla extract – For flavor warmth.
1 teaspoon flaky sea salt (such as Maldon) – This is not optional. It cuts through the sweetness and elevates the entire bar.
For the Chocolate Topping
12 ounces (340g) semi-sweet or dark chocolate (60-70% cocoa), finely chopped – High-quality chocolate is essential for a shiny, snappy top that doesn’t taste waxy.
1 tablespoon coconut oil or vegetable oil (optional) – Adds a subtle sheen and helps the chocolate cut cleanly when slicing.
Instructions
Step 1: Make the Shortbread Crust
Preheat & Prepare: Preheat your oven to 350°F (175°C) . Line a 9×9-inch square baking pan with parchment paper, leaving an overhang on two opposite sides. This will act as handles to easily lift the finished bars out later.
Combine Dry Ingredients: In a food processor (or a large bowl using a pastry cutter), pulse the flour, granulated sugar, and salt to combine.
Cut in the Butter: Add the cold, cubed butter. Pulse until the mixture resembles coarse sand with a few pea-sized butter pieces remaining. If doing by hand, use a pastry blender or your fingertips until you reach the same consistency.
Press into Pan: Pour the crumb mixture into the prepared pan. Press it down firmly and evenly into the bottom. Using the bottom of a flat measuring cup or a glass helps create a compact, even layer.
Par-Bake: Bake for 18-22 minutes, or until the edges are just lightly golden brown. The crust will still be soft but should look set. Remove from the oven and allow to cool on a wire rack while you make the caramel. Keep the oven on if you plan to use it for the caramel topping (though stovetop method is recommended here).
Step 2: Make the Salted Caramel
Combine Ingredients: In a medium-sized, heavy-bottomed saucepan (3-4 quarts) over medium heat, combine the sweetened condensed milk, brown sugar, butter, and corn syrup.
Melt and Stir: Stir constantly with a wooden spoon or silicone spatula until the butter is melted and all ingredients are combined.
Cook to Thickness: Continue to cook, stirring constantly, until the mixture comes to a gentle boil. Reduce the heat slightly to maintain a low, steady boil. Stir continuously for 8-12 minutes. The mixture will thicken and turn a deep, rich golden amber color.
Pro Tip: If you have a candy thermometer, cook until the caramel reaches 240°F (115°C) —the “soft ball” stage. This ensures a firm-but-chewy caramel that won’t ooze out when you cut the bars.
Finish: Remove the pan from the heat. Stir in the vanilla extract and half of the flaky sea salt.
Assemble: Immediately pour the hot caramel over the cooled shortbread crust. Using an offset spatula, spread it into an even layer. Sprinkle the remaining flaky sea salt over the top. Set aside to cool for 30 minutes at room temperature, then transfer to the refrigerator to firm up for at least 1 hour.
Step 3: Add the Chocolate Topping
Melt Chocolate: Place the finely chopped chocolate and oil (if using) in a heatproof bowl. Microwave in 20-second intervals, stirring vigorously between each, until about 80% melted. Then, stop microwaving and stir continuously until the residual heat melts the remaining chocolate. This method prevents overheating and seizing.
Spread: Remove the pan from the refrigerator. Pour the melted chocolate over the firm caramel layer. Tilt the pan or use a spatula to spread the chocolate into a smooth, even layer.
Set: Return the pan to the refrigerator for at least 1-2 hours, or until the chocolate is completely set.
Step 4: Slice and Serve
Lift & Cut: Use the parchment paper overhang to lift the entire block out of the pan. Place it on a cutting board.
The Perfect Cut: For clean slices, use a large, sharp chef’s knife. Run the knife under hot water, dry it off, and then slice. Repeat this process—heating, drying, and slicing—for each cut. This prevents the chocolate and caramel from cracking or dragging.
Serve: For the best texture, allow the bars to sit at room temperature for 10 minutes before serving. This softens the caramel slightly for a perfect bite.
Storage & Make-Ahead Tips
Storage: Store in an airtight container in the refrigerator for up to 1 week. The layers are most stable when chilled.
Make Ahead: This is the perfect make-ahead dessert! The bars can be made entirely and frozen for up to 3 months. Wrap the uncut block tightly in plastic wrap, then foil. Thaw overnight in the refrigerator before slicing and serving.
Room Temperature: While safe to leave out for a few hours, the caramel will become very soft and the chocolate may bloom if the room is warm. Refrigeration is recommended for maintaining the signature layered structure.
Nutrition Information
Note: Nutritional information is an estimate and should be considered for informational purposes only. It is calculated based on 16 servings.
Nutrient Amount Per Serving (1 bar)
Calories 385 kcal
Total Fat 22g
Saturated Fat 13g
Trans Fat 0g
Cholesterol 45mg
Sodium 180mg
Total Carbohydrates 44g
Dietary Fiber 2g
Total Sugars 35g
Protein 5g
Calcium 78mg
Iron 2mg
Potassium 210mg