Biscoff Caramel Slice Thermomix

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Biscoff Caramel slice is another way to enjoy the uniquely flavoured, spiced Biscoff cookie in a dessert-style treat. This layered slice starts with a Biscoff biscuit crumb base, a layer of rich baked caramel, and a thin chocolate layer that holds the Biscoff crumb topping in place.

Biscoff Caramel Slice cut in pieces, two on a serving place and the rest on a platter

This is a three-layer slice but it’s super simple to make and can be easily prepared on the stove-top if you don’t have a Thermomix. I will directions for both methods below. Making the caramel filling in the Thermomix feels like cheating as you just add the ingredients and walk away. It’s a completely “hands-free” layer!

The Biscoff Caramel Slice Story

The other day I needed a coffee whilst I was out and about near Terrigal. Happily, I spotted a car park right out the front of a cafe called Sal & Co. If you know the area you would know that a carpark is GOLD, it means the Gods are smiling. I nabbed the park and went inside to order. The aroma of coffee was music to my nose. As I waited in line I noticed a ver enticing cake display.

I knew it was a mistake to look at the array of slices, cakes, cheesecakes, and more, but I couldn’t help it. Before I knew it I was choosing between a mini Lemon Meringue Pie and a Biscoff Caramel Slice. I ordered the Biscoff Slice with my coffee and hurried to the car.

After craving a coffee all morning I had barely a mouthful before I took a generous bite of the slice. Oh, Dear!! It was so much better and sweeter and more delicious than I imagined it would be. I knew I was in trouble! This cafe was WAY too close to home!

As I savoured every bite I analysed the layers. It was a really simple slice but it certainly added up to more than the sum of its layers.

At that point, I decided I would make my own Biscoff Slice. Of course, that meant going back a few more times to the Sal & Co cafe… for quality control purposes of course.

Biscoff Slice Ingredients and Substitutes

When I was testing the recipe I had trouble finding Biscoff Biscuits, so I first made the slice with Speculaa biscuits. Speculaa’s are a Dutch spiced cookie that is sometimes found in the international section of the supermarket. I also found a version in Aldi!

Speculaa V’s Biscoff

Speculaa’s and Biscoff are different biscuits but they both have a rich dark caramel flavour. The Speculaa’s add a hint of cinnamon, cloves, cardamom, and ginger to the base and crumb.

The Biscoff has a more caramelised crispy, toffee sugar taste. The crumb topping is slightly darker and sweeter.

The results were fabulous with either brand of cookie. If you have trouble finding the cookie of your choice, feel free to substitute it with the other. I had more luck in Aldi and Coles. I have a feeling Woolworths have discontinued both.

Biscoff Caramel slice on a white serving plate with knife and platter

Slice Tips and Watchpoints

  1. Start with the correct size slice tin. 30 x 20cm (12″ x 8″) Changing the size of the tin will change the thickness of the caramel and it may not cook sufficiently to be firm when cut. If your slice is squishy when you cut it then the caramel hasn’t cooked for long enough or it was too thick due to a small slice tin.
  2. Cook the caramel layer until it has bubbled and is cooked through. All ovens are a little bit different so please watch this stage carefully. It’s better to be a little over than under-done.
  3. Add oil to the chocolate as directed. The oil makes the chocolate less likely to be hard and shatter when cut.
  4. Score the chocolate layer of the slice before it goes into the fridge. A neater cut will be achieved. Place the slice in the fridge and cut fully once it has just set.

Step By Step Biscoff Picture Instructions

If you are having any problems with the directions, please take a look at the pictures below. You will note the darker colour of the caramel.

Step by step pictures showing how to make the Biscoff Caramel slice

Thermomix Slice Recipes

If you have a bit of a sweet tooth, why not take a look at some of my other Thermomix Slice recipes? They are all super easy to make and a whole tray cost about the same as a slice from your local cafe.

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I share loads of great recipes on the page. Our community group page is a fabulous place to ask questions and share images of recipes you have made! It helps inspire others to cook new and interesting dishes.

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Biscoff Caramel slice on a white serving plate with knife and platter

Biscoff Caramel Slice – Thermomix and Conventional

Julie Carlyle
This cafe-style 3-layer slice has a Biscoff cookie base, baked caramel layer, melted chocolate then a Biscoff crumb. Simple!! … not so simple to share!!!
Prep Time 10 mins
Cook Time 35 mins
Total Time 45 mins
Course Dessert, Slice, Snack, Sweet
Cuisine Australian
Servings 30 slices
Calories 136 kcal




  • 125 g butter cubed salted
  • 220 g Biscoff Cookies *or substitute for Speculaa's

Caramel Layer

  • 120 g golden syrup * see note under ingredients
  • 125 g butter salted
  • 2 x 390 g can sweetened condensed milk

Chocolate Topping

  • 180 g dark chocolate or milk chocolate *your choice
  • 2 tsp vegetable oil

Crumble Topping

  • 50 g Biscoff Cookies * Broken into crumbs


  • Preheat oven to 180 degrees (350F). Line a 20 x 30cm (8 x 12 inch) slice tray with baking paper.
  • Place butter in TM bowl. Melt 2 1/2 min/100 degrees/Speed 2.
    125 g butter
  • Add Biscoff Cookies to the butter. Combine 8 sec/Speed 9.
    220 g Biscoff Cookies
  • Add ingredients to the prepared tray and press down to form the base. Refridgerate until needed.

Caramel Layer

  • Add golden syrup, butter and condensed milk to TM bowl. Heat 10 min/100 degrees/Speed 3 (MC OUT)
    120 g golden syrup, 125 g butter, 2 x 390 g can sweetened condensed milk
  • Wipe moisture from the TM lid without getting liquid in the caramel. Cook 3 min/Varoma/Speed 3 (MC OUT)
  • Pour the caramel over the base.
  • Return the slice to the oven for 10-15 minutes until the caramel has bubbled and set. It should have darkened all over.
  • Refrigerate the slice until it has fully cooled.

Chocolate Topping

  • Add chocolate and oil to a microwave safe bowl.
  • Heat in the microwave for 90 seconds stopping at 30 second intervals to stir.
    180 g dark chocolate or milk chocolate, 2 tsp vegetable oil
  • Once the chocolate is fully melted pour over the cooled slice.

Biscoff Crumble Garnish

  • Add the remaining cookie crumbs evenly to the top of the slice whilst the chocolate is still melted.
    50 g Biscoff Cookies
  • Leave the slice to set at room temperature. 
  • Slice as soon as the chocolate has cooled and is firm. Refrigerate until required.


The vegetable oil makes the chocolate easier to cut. Without oil, the chocolate layer may crack when you try to cut it.
It is very important to make the slice in the correct size tin. A smaller tin will result in a thicker caramel layer which will take longer to cook in the oven. The top may actually burn before the caramel has reached the setting point if it is too thick.


Calories: 136kcalCarbohydrates: 14gProtein: 2gFat: 8gSaturated Fat: 5gPolyunsaturated Fat: 0.3gMonounsaturated Fat: 2gTrans Fat: 0.2gCholesterol: 17mgSodium: 89mgPotassium: 80mgFiber: 1gSugar: 10gVitamin A: 184IUVitamin C: 0.3mgCalcium: 37mgIron: 1mg
Keyword Biscoff, Caramel, Caramel Slice, Chocolate, Chocolate Slice, slice, Speculaa, Sweet snack, Thermomix Slice
Tried this recipe?Let us know how it was!

Sal & Co Cafe

Don’t forget, if you have a craving for a sweet and no time to cook you can always say hello to my friends at Sal & Co. This is the source of today’s cooking inspiration.

Shop 1, 82A Ocean View Drive
Wamberal NSW 2260
(02) 4339 8960

Biscoff Caramel Slice – Conventional Method

  1. Preheat oven to 180 degrees (350F). Line a 20 x 30cm (8 x 12 inch) slice tray with baking paper.
  2. Place melted butter in a bowl with crushed biscuits.
  3. Use a fork to combine.
  4. Press the base ingredients into the prepared tray.
  5. Place in the fridge.
  6. Next, add golden syrup, butter, and condensed milk to a saucepan.
  7. Stir over low heat for about ten minutes until the caramel has thickened slightly.
  8. Pour the caramel over the base and place it in the oven for 10-15 minutes.
  9. Refrigerate the slice until it has thoroughly cooled.
  10. In a microwave-safe bowl add the chocolate and vegetable oil.
  11. Heat the chocolate in the microwave for 90 seconds stopping at 30-second intervals to stir.
  12. Once the chocolate has melted pour it over the cooled slice.
  13. Add the remaining cookie crumbs to the melted chocolate in an even layer.
  14. Leave the slice to set at room temperature.
  15. Cut the slice as soon as the chocolate has cooled.
  16. Refrigerate until required.
Square image of two biscoff slices on a white plate

I hope you have enjoyed this recipe. If you have made this dish I would love for you to come back and comment.

Leaving a comment and a star rating helps others decide if they should try my recipe. Plus if you hit the social media share buttons, your friends may find a delicious new recipe too!

Thank you for stopping by,

Happy Cooking



7 thoughts on “Biscoff Caramel Slice Thermomix”

  1. Andrea Summerfield says:

    5 stars
    Just heavenly!

    1. Julie Carlyle says:

      Hi Andrea
      I’m so pleased you think so:)
      J xx

  2. Tanya Perkins says:

    5 stars
    Made this on the weekend and took it to work, and OMG it was a hit! Everybody loved it!

  3. Rhonnie says:

    5 stars
    Absolutely delicious slice , thank you for sharing the recipe

    1. Julie Carlyle says:

      Hi Rhonnie
      I’m so pleased you enjoyed the slice.
      Thank you so much for coming back and leaving a comment.
      Happy Cooking

  4. Sarah Buttler says:

    5 stars
    Simply amazing! This is so delicious!

  5. Jaime Bird says:

    5 stars
    Best slice recipe there is

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