Triple-Layer Millionaire’s Shortbread with Salted Caramel Step-by-step instructions

Before you start

Before beginning the process, gather all your ingredients and measure them accurately. Ensure your baking pan is lined with parchment paper, leaving an overhang on the sides to make removing the finished bars much easier.

Have your digital thermometer ready near the stove, as the caramel stage requires constant attention once it begins to boil.

Preheating the oven is the first step, so ensure it reaches the correct temperature before you start preparing the shortbread dough to maintain a consistent baking environment.

Instructions

Shortbread Base

1. 1Prepare the shortbread base
   Mix the softened butter with flour and a touch of sugar until a crumbly dough forms. Press the mixture firmly into the bottom of a parchment-lined square baking pan. Bake in a preheated oven until light golden brown. Remove from the oven and allow it to cool completely before adding the caramel layer.
   Look for The shortbread should look pale golden and feel firm to the touch.
   Tip Ensure the shortbread is pressed evenly to prevent uneven baking.

The shortbread should be a uniform, pale golden color across the surface. It should feel dry and firm when pressed lightly. Allow it to cool completely on a wire rack before attempting to add the caramel, as any residual heat will soften the base and compromise the integrity of the subsequent layers.

Caramel Layer

2. 2Cook the salted caramel
   Combine the butter, brown sugar, and sweetened condensed milk in a heavy-bottomed saucepan over medium heat. Stir constantly to prevent burning. Bring the mixture to a slow boil and continue cooking until it reaches 225°F (107°C) on a digital thermometer. Pour the thickened, amber-colored caramel over the cooled shortbread base, spreading it into an even layer with an offset spatula.
   Look for The caramel will thicken significantly and turn a deep golden amber color.
   Tip Use a heavy-bottomed pan to ensure consistent heat distribution.

The caramel is perfectly cooked when it reaches a deep, rich amber hue and coats the back of a wooden spoon thickly. It should smell toasted and sweet. Ensure it is spread evenly across the shortbread, reaching all corners of the pan to create a consistent thickness throughout the final bars.

Chocolate Finish

3. 3Apply the chocolate topping
   Melt the dark chocolate and pour it over the set caramel layer. While the chocolate is still soft, drizzle the white chocolate over the top and use a toothpick or skewer to feather the surface for a decorative effect. Finish by placing small pieces of edible gold leaf onto the chocolate. Allow the bars to set fully in the refrigerator before slicing into squares.
   Look for The chocolate should be glossy and smooth, then firm after chilling.
   Tip Slice with a warm knife for perfectly clean edges.

The final layer is complete when the chocolate is smooth, glossy, and fully set. The feathered white chocolate design should be visible on the surface. Once chilled, the entire block should be firm, allowing for clean cuts into squares without the caramel layer oozing out from the sides.

Common mistakes

A common mistake is rushing the caramel cooling process. If you pour the chocolate while the caramel is still warm, the two layers will bleed together, losing the distinct visual appeal.

Another error is failing to use a thermometer for the caramel; if the mixture is undercooked, the bars will be messy to handle, while overcooking can lead to a hard, brittle texture that is difficult to bite through. Always use low to medium heat to avoid scorching the milk solids in the caramel.

How to tell it’s done

The shortbread is done when it is pale golden and firm. The caramel is ready when it reaches 225°F (107°C), showing a thick, glossy, and deep amber appearance. The chocolate is set when it is firm to the touch after chilling in the refrigerator for at least one hour.

When cutting, the knife should glide through the layers without cracking the chocolate excessively, indicating the layers are properly set and ready to be served at room temperature.