Millionaire’s Biscoff Bars

The recipe, step by step

These Millionaire’s Biscoff bars are a fun twist on the British classic, with a crunchy Biscoff biscuit base, a thick layer of sweet-salty peanut caramel and a smooth dark chocolate topping.

I adapted the traditional idea into something a little different, using spiced Biscoff biscuits instead of shortbread and adding roasted salted peanuts to the caramel. The combination works brilliantly: crisp biscuit underneath, soft caramel in the middle and rich chocolate on top.

They are also completely no-bake. The only cooking is done on the hob, then the refrigerator takes care of the rest while the layers set.

Serve them on their own, with a cup of coffee or tea, or cut them into smaller pieces when you want something a little less indulgent.

If you love Biscoff, you could even make the base with my Homemade Biscoff Biscuits. For more traybake inspiration, try my Cherry Almond Cookie Bars or Lemon Bars.

Recipe Highlights

• Ease: Easy and completely no-bake.
• Taste: Spiced Biscoff, buttery caramel, salty roasted peanuts and rich dark chocolate.
• Texture: Crunchy biscuit base, soft peanut caramel and smooth chocolate topping.
• Serving: Delicious on their own or with a hot drink or glass of milk.
• Quantity: 12 generous bars, although the finished bake can be cut into as many as 24 smaller pieces.
• Tin: 20 cm / 8-inch square baking pan.
• Preparation: 20 minutes.
• Chilling: 1 hour 10 minutes.
• Total time: 1 hour 30 minutes.

Why You’ll Love These Millionaire’s Biscoff Bars

There is a lot going on in every bite. The Biscoff base brings its distinctive caramelised spice, while the roasted salted peanuts stop the caramel layer from becoming overwhelmingly sweet.

Meanwhile, the dark chocolate adds a deeper flavour on top. Adding double cream turns it into a softer ganache, so the chocolate does not become rock-hard when chilled.

They are also very straightforward to prepare. There is no pastry to roll and no oven to switch on; simply press the biscuit base into the tin, cook the caramel, add the chocolate topping and leave everything to chill.

Better still, you can cut the finished slab into 12 generous bars or up to 24 smaller pieces depending on how you plan to serve them.

Ingredients and Substitutions

Biscoff Biscuit Base

• Biscoff biscuits: Use 350 g Biscoff biscuits. Their crisp, caramelised, lightly spiced flavour makes a great alternative to the traditional shortbread base. Other speculoos-style biscuits can also be used.
• Butter: Use 100 g melted butter. It binds the biscuit crumbs together so they form a firm base once chilled.

Peanut Caramel

• Sweetened condensed milk: Use 1 × 397 g tin condensed milk. It forms the sweet, creamy base of the caramel.
• Butter: Use 200 g butter for richness and the characteristic soft caramel texture.
• Golden syrup: Use 100 g golden syrup. Light corn syrup can be used instead.
• Vanilla: Use 1 teaspoon pure vanilla extract or ¼ teaspoon vanilla paste. Vanilla rounds out the caramel flavour and works particularly well with the Biscoff and chocolate.
• Roasted salted peanuts: Use 200 g roasted salted peanuts. They add crunch and a salty contrast to the sweet caramel.

Chocolate Ganache Topping

• Dark chocolate: Use 200 g dark chocolate containing at least 65% cocoa solids. The darker chocolate helps balance the sweetness of the biscuit base and caramel.
• Double cream: Use 200 g double cream, also known as heavy cream in the US, if making the ganache topping. It softens the chocolate so that the top layer remains easier to bite and slice.

Chocolate recommendations: bars – Lindt Excellence dark 70% bar 100g, Montezuma’s darkside 51% bar 90g, Menier dark cooking chocolate 100g, Green and Black’s Organic dark Chocolate 100g, 1kg bags – Callebaut dark chocolate, Callebaut milk chocolate, Callebaut white chocolate.

• Sea salt flakes: Add a pinch over the finished chocolate layer, if you like, for an extra salty contrast.

Nigel recommends

Vanilla Bean Paste

Nielsen-Massey vanilla bean paste works particularly well in the peanut caramel, adding a rich, rounded vanilla flavour that complements the Biscoff, roasted peanuts and dark chocolate.

Ingredient

Nielsen Massey

Vanilla Bean Paste

Rich vanilla bean paste with a concentrated vanilla flavour and visible vanilla seeds, ideal for cakes, biscuits, custards, creams and glazes.

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How to Make Millionaire’s Biscoff Bars

Make the Biscoff Base

1. Prepare the tin: Line a 20 cm / 8-inch square baking pan with baking or parchment paper.

2. Make the biscuit base: Place the Biscoff biscuits in a food processor or sealed plastic bag and crush them into fine crumbs. Melt the 100 g butter and mix it thoroughly with the biscuit crumbs.

3. Press into the tin: Transfer the biscuit mixture to the prepared pan and press it firmly into the corners to create an even, compact base. Place the pan in the refrigerator to help the base set.

Make the Peanut Caramel

4. Cook the caramel: Place the 200 g butter, condensed milk, vanilla and golden syrup in a tall saucepan. Bring the mixture to the boil, stirring continuously. Cook for approximately 6–8 minutes, until the caramel thickens and turns golden brown. Do not heat it too quickly, as it can burn very easily.

5. Add the peanuts and chill: Stir in the 200 g roasted salted peanuts, then pour the caramel over the cooled Biscoff base. Return the pan to the refrigerator for 30–60 minutes, until the caramel has cooled completely.

Add the Chocolate Topping

6. Prepare the chocolate: Chop the 200 g dark chocolate into small, even pieces. If you are making the ganache, place the chopped chocolate in a heatproof bowl.

7. Choose your topping: For a simple chocolate topping, gently melt the chocolate in a heatproof bowl set over a pan of barely simmering water, stirring occasionally until completely smooth. For a softer chocolate ganache, pour 200 g double cream into a small saucepan and heat gently until it just reaches a simmer.

8. Make the ganache, if using: Pour the hot cream over the chopped chocolate and leave it undisturbed for 1–2 minutes. Then stir gently from the centre outwards until the chocolate and cream combine into a smooth, glossy ganache.

9. Add the chocolate layer: Make sure the caramel is completely cool before adding the topping. Pour either the melted chocolate or chocolate ganache over the caramel and use an offset spatula, if necessary, to spread it into a smooth, even layer right to the edges.

10. Finish and chill: Sprinkle the top with sea salt flakes, if using. Leave the chocolate to settle briefly, then chill the bars until the topping has fully set before slicing.

Which Topping Should I Choose?

For a firmer chocolate layer with a clean snap, use the 200 g dark chocolate on its own.

For a softer, creamier topping that is easier to bite and slice, make the ganache using 200 g dark chocolate and 200 g double cream.

The choice also affects storage: bars topped with plain chocolate can be stored in an airtight container at room temperature for up to 5 days, while bars made with the cream-based ganache should be refrigerated and eaten within 3–4 days.

Cut the Bars

11. Slice the bars: Remove the chilled slab from the pan and cut it into 12 generous bars or up to 24 smaller pieces. Lightly scoring the chocolate first can make cutting easier. A large sharp 24–26 cm knife is particularly useful because it can cut straight through the width of the bake in one motion. If necessary, warm the knife in hot water and dry it thoroughly before making each cut.

Variations

Change the Biscuit Base

Biscoff gives these bars their distinctive spiced caramel flavour, but you can replace the biscuits with another firm biscuit or cookie.

Oreos, malted milk biscuits or digestives are all alternatives suggested in the original recipe.

Leave Out the Peanuts

The peanuts can be omitted if you would prefer a plain caramel layer.

Change the Nuts

Try replacing the peanuts with almonds, pecans or hazelnuts for a different flavour and texture.

Decorate the Chocolate

For a more decorative finish, swirl a little melted white chocolate through the dark chocolate before it sets.

You can also scatter M&M’s or Maltesers over the top.

Nigel’s Recipe Tips

Keep the Heat Under Control

Caramel needs attention.

Keep the heat controlled and stir continuously while the butter, condensed milk, vanilla and golden syrup cook together. Turning the heat up to speed things along can cause the mixture to catch and burn very quickly.

Use a Tall Saucepan

The caramel comes to the boil while being stirred, so a taller saucepan gives you more room to work safely and reduces the chance of the mixture overflowing.

Wait Until the Caramel Is Completely Cool

Give the caramel its full 30–60 minutes of chilling before adding the chocolate layer.

If the caramel is still warm, the chocolate and caramel can begin to mix together rather than forming two clean layers.

Press the Biscuit Base Firmly

Compact the biscuit crumbs firmly into the corners and across the bottom of the pan.

A tightly packed base is much less likely to crumble when you eventually cut the bars.

Choose the Chocolate Topping You Prefer

For a firmer chocolate layer with more of a snap, use the 200 g dark chocolate on its own.

For a softer topping that is easier to bite and slice straight from the fridge, make the ganache with 200 g dark chocolate and 200 g double cream.

The choice also affects storage: bars topped with plain chocolate can be kept at room temperature for up to 5 days, while bars made with fresh-cream ganache should be refrigerated and eaten within 3–4 days.

Chop the Chocolate Finely

Smaller chocolate pieces melt much more readily when the hot cream is poured over them.

After adding the cream, leave everything untouched for a minute or two before stirring.

Score the Chocolate Before Cutting

Lightly score the set chocolate before pressing the knife completely through the bars.

This can help guide your cuts and reduce the chance of the topping cracking unpredictably.

Warm the Knife for Cleaner Slices

A large sharp knife makes cutting much easier. If necessary, dip the blade into hot water, wipe it completely dry and then cut straight down through the slab.

Repeat between cuts when you want particularly clean edges.

Frequently Asked Questions

Are Millionaire’s Biscoff Bars No-Bake?

Yes. The biscuit base does not need baking.

The caramel is cooked on the hob, while the remaining layers are set in the refrigerator.

How Many Bars Does the Recipe Make?

The WPRM recipe gives 12 bars as the serving quantity.

However, the finished slab can be cut into 12–24 pieces, so smaller portions are easy when you are serving a larger group.

Can I Use Something Other Than Biscoff Biscuits?

Yes. The recipe suggests Oreos, malted milk biscuits or digestives as alternatives.

Can I Use Light Corn Syrup Instead of Golden Syrup?

Yes. WPRM specifically allows light corn syrup as an alternative to golden syrup.

Can I Make Them Without Peanuts?

Yes. The peanuts can be omitted.

Alternatively, try almonds, pecans or hazelnuts.

What Percentage Dark Chocolate Should I Use?

Use dark chocolate containing at least 65% cocoa solids.

This gives the topping enough depth to balance the very sweet caramel layer.

Why Did My Caramel Burn?

The caramel may have been heated too aggressively or not stirred continuously.

Once the mixture begins boiling, keep stirring and watch it carefully. It should become golden brown and thick after approximately 6–8 minutes.

Why Do I Need to Cool the Caramel Before Adding the Chocolate?

The layers need to remain distinct.

If the caramel is still warm, it can soften or mix into the chocolate topping rather than giving you the clean layers associated with millionaire’s bars.

How Do I Cut Millionaire’s Bars Without Cracking the Chocolate?

Lightly score the chocolate first, then use a large sharp knife to cut straight down.

Warming the blade in hot water and drying it thoroughly can also help produce cleaner cuts.

Tools You’ll Need

• 20 cm / 8-inch square baking pan
• Baking or parchment paper
• Food processor or strong food bag and rolling pin
• Tall saucepan for the caramel
• Small saucepan for the cream
• Heatproof bowl
• Spatula
• Offset spatula
• Large sharp 24–26 cm knife
• Digital kitchen scales

Storage and Freezing

If you finish the Millionaire’s Biscoff bars with plain melted chocolate, keep them in an airtight container at room temperature for up to 5 days.

If you make the chocolate ganache with double cream, store the bars in an airtight container in the refrigerator. They will keep for 3–4 days.

For the best texture, let refrigerated bars sit at room temperature for a short while before serving so the caramel and ganache can soften slightly.

Freezing

The bars can be wrapped in cling film or placed in an airtight container and frozen for up to 1 month.

Allow them to defrost completely before serving.

Nutrition

Serving: One bar, based on 12 portions.

Nutrition information is provided as an estimate and may vary depending on the ingredients and portion size used.

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