This indulgent Biscoff Millionaire’s Traybake transforms the classic millionaire’s shortbread with the irresistible addition of Biscoff spread, creating layers of buttery shortbread, creamy caramel, and rich chocolate. The warm, spiced flavor of Biscoff perfectly complements the traditional caramel-chocolate combination, elevating this beloved treat to new heights of decadence.

Why You’ll Love This Recipe

• Incredible flavor combination of classic millionaire’s shortbread with the distinctive caramelized cookie taste of Biscoff
• Perfect balance of textures: crisp shortbread base, soft caramel middle, and snappy chocolate top
• Make-ahead friendly dessert that’s ideal for gatherings, bake sales, or gifting
• No specialty equipment needed—just basic kitchen tools and a baking tin
• Easily customizable with different chocolate types or additional toppings

Ingredients

• Digestive Biscuits or Graham Crackers: These form the foundation of your shortbread layer. The subtle sweetness and satisfying crunch make them perfect for creating a stable base.
• Butter: Use high-quality unsalted butter for both the base and caramel layers to control the saltiness and achieve the richest flavor. For a dairy-free option, coconut oil can work in the base.
• Sugar: Regular granulated sugar helps bind the shortbread base, while brown sugar adds depth and a caramel-like flavor to the middle layer.
• Sweetened Condensed Milk: This creates the signature smooth, creamy texture in the caramel layer that makes millionaire’s shortbread so irresistible.
• Biscoff Spread: The star ingredient that gives this traybake its distinctive flavor. Look for the smooth variety for easier incorporation into both the caramel and chocolate layers.
• Milk Chocolate: Creates a perfect sweet topping that complements the spiced Biscoff flavor. Choose a good quality chocolate for the smoothest melting and best flavor.

Variations

Dark Chocolate Biscoff Layer

Substitute the milk chocolate with dark chocolate (70% cocoa) for a more intense flavor that beautifully contrasts with the sweetness of the caramel and Biscoff. The slightly bitter notes of dark chocolate create a more sophisticated flavor profile.

Salted Caramel Biscoff

Add a half teaspoon of sea salt flakes to the caramel mixture while cooking and sprinkle a few flakes on top of the chocolate layer before it sets. The salt enhances the caramel notes in both the Biscoff and traditional caramel layer, creating a more complex flavor experience.

White Chocolate Biscoff Swirl

Replace the milk chocolate with white chocolate and create a beautiful marbled effect by warming additional Biscoff spread until pourable, then swirling it through the white chocolate layer before it sets. This creates a stunning visual effect and intensifies the Biscoff flavor.

How to Make the Recipe

Step 1: Prepare the Shortbread Base

Start by crushing your digestive biscuits or graham crackers to fine crumbs – you can use a food processor for speed or place them in a sealed bag and crush with a rolling pin. Mix thoroughly with melted butter and sugar until the mixture resembles wet sand with no dry spots. Press firmly into your lined baking tin, creating an even, compact layer. The back of a measuring cup works perfectly for creating a smooth, level surface. Refrigerate for at least 30 minutes to ensure the base sets properly and can support the next layers.

Step 2: Create the Biscoff Caramel Layer

When making the caramel, patience is key. Melt the butter, brown sugar, and condensed milk over medium heat, stirring constantly to prevent the mixture from catching on the bottom of the pan. Once it begins to bubble, reduce the heat and continue stirring for 5-7 minutes until it thickens noticeably and takes on a deeper golden color. The caramel should coat the back of a spoon and leave a clear line when you run your finger through it. Off the heat, stir in the Biscoff spread until completely incorporated, then pour over your set biscuit base, using a spatula to create an even layer. Refrigerate for at least an hour to allow the caramel to set completely.

Step 3: Perfect the Chocolate Topping

For the final layer, gentle melting is crucial. If using a microwave, heat the chocolate and Biscoff spread in 20-30 second increments, stirring between each interval to prevent burning. For a double boiler method, ensure the water doesn’t touch the bottom of your bowl and stir regularly as the mixture melts. Once completely smooth and combined, pour over the set caramel layer, tilting the tin gently to spread the chocolate or using an offset spatula for a perfectly smooth finish. Return to the refrigerator for at least 2 hours to set completely.

Step 4: Slice and Serve

The key to perfect squares is patience and the right cutting technique. Remove the traybake from the refrigerator 10-15 minutes before slicing to prevent the chocolate from cracking. Use a sharp knife dipped in hot water and wiped dry between cuts for the cleanest edges. Apply firm, even pressure when cutting, using a straight-down motion rather than a sawing action. Store any leftovers in an airtight container.

Tips for Making the Recipe

• For cleaner cuts, use a hot, dry knife and wipe the blade between slices. Allow the traybake to sit at room temperature for 15 minutes before cutting to prevent the chocolate from shattering.
• When making the caramel, use a heavy-bottomed saucepan and stir constantly to prevent burning. The mixture should reach a deep golden color but not darken too much, which would indicate it’s beginning to burn.
• Line your baking tin with parchment paper, leaving some overhang on the sides to easily lift out the entire traybake when set.
• For the chocolate layer, melting the chocolate with the Biscoff spread helps prevent the chocolate from setting too hard, making it easier to cut without cracking.
• Chill each layer thoroughly before adding the next—patience results in distinct, beautiful layers that won’t bleed into each other.
• If you find your shortbread base too crumbly, add an extra tablespoon of melted butter to help it hold together better.

How to Serve

Serve this Biscoff Millionaire’s Traybake cut into generous squares as a decadent afternoon treat with coffee or tea—the caramelized notes in the Biscoff perfectly complement a rich espresso or creamy latte. For an elevated dessert presentation, place individual squares on small plates with a dollop of lightly whipped cream and a light dusting of cinnamon or crushed Biscoff cookies. You can also create a show-stopping dessert by serving slightly warmed squares with a scoop of vanilla ice cream, allowing the chocolate to soften slightly against the cold ice cream for a delightful temperature contrast.

Make Ahead

This traybake is perfect for preparing in advance, as the flavors actually develop and improve with time. You can make the entire traybake up to 3 days ahead and store it in the refrigerator, well-wrapped in plastic film or in an airtight container. For longer storage, individual squares can be frozen for up to 2 months—simply wrap each piece in plastic wrap and then aluminum foil before placing in a freezer bag. To thaw, unwrap and place in the refrigerator overnight, then bring to room temperature for about 30 minutes before serving for the best texture and flavor.

FAQs

Can I use other cookies for the base instead of digestive biscuits?

Absolutely! While digestive biscuits create the traditional shortbread texture, you can substitute with graham crackers, vanilla wafers, or even crushed Biscoff cookies for an intensified flavor experience. Just ensure whatever cookie you choose crumbles well and combines easily with butter to form a firm base.

Why did my caramel layer not set properly?

The most common reason for a runny caramel layer is insufficient cooking time. The caramel mixture needs to bubble gently for 5-7 minutes while being constantly stirred to reach the right consistency. You’ll know it’s ready when it thickens noticeably and deepens in color. Also, ensure you’re using full-fat sweetened condensed milk, as lighter versions contain more water and won’t set as firmly.

Can I make this recipe without Biscoff spread?

Yes, you can create a traditional millionaire’s shortbread by omitting the Biscoff spread from both the caramel and chocolate layers. Alternatively, you can substitute with other spreads like Nutella for a chocolate-hazelnut variation, or peanut butter for a different but equally delicious flavor profile.

How long will this traybake keep?

When stored in an airtight container in the refrigerator, this Biscoff Millionaire’s Traybake will keep well for up to a week. The flavors actually develop nicely over the first 24-48 hours. You can also freeze cut pieces for up to 2 months, well-wrapped to prevent freezer burn.

Conclusion

This Biscoff Millionaire’s Traybake brilliantly reimagines a classic dessert with the warm, spiced notes of everyone’s favorite cookie butter. With its perfect balance of textures—crisp base, silky caramel, and snappy chocolate—each bite delivers pure indulgence. Whether you’re preparing it for a special occasion or simply treating yourself, this irresistible traybake is guaranteed to impress. The layers of flavor complexity might look intimidating, but the straightforward process yields professional-looking results that will have everyone asking for your secret. Give this recipe a try and discover your new favorite way to enjoy the distinctive taste of Biscoff!

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