This delicious Witches Brew Tart has an Oreo Biscuit Base, delicious milk chocolate ganache filling decorated with lots of Halloween treats.

I have been so excited to share this recipe with you. I mean just LOOK at how amazing it looks. This is the perfect Halloween treat to share with your family/friends/colleagues/neighbours basically everybody. Or why not wait until after Halloween and make it using all the leftover candy you have?

Oreo Base

Because it is Halloween I wanted to make this as chocolatey as possible you can use any biscuits you want. Why not try the Biscoff base from my Vegan Biscoff Tart or a golden oreo and hobnob biscuit base from my White Chocolate and Strawberry Tart.

If you are using Oreos you need to just use the normal ones, not the double stuffed ones. You need to blitz your Oreos to a crumb I did this in a food processor. If you don’t have a food processor you could also pop them into a food-safe bag and bash them with a rolling pin.

Next, add the melted butter to your blend again and pulse until the Oreo crumbs resemble sand. I know this sounds weird because Oreos are black and not at all like sand but hopefully, this makes sense.

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If you bashed your Oreos with a rolling pin add the Oreos to the bowl with your melted butter and mix until your Oreos are coated in the butter.

Press them into your tart tin. I used a 22cm tart tin. I find it easiest to pour all the mixture into the bottom of the tin and then go around the sides first using the back of a spoon to press the mixture in. Then I press the remaining mixture into the base of the tin.

You want to have quite a thick sides so that they hold the filling you don’t want any gaps where the filling could escape and cause a big sticky mess.

Witches Brew Tart Filling

Once my base is ready I pop it to one side and make the filling.

For the filling, I used milk chocolate but you could also use dark or white chocolate if you prefer. I mix it with double cream. Depending on where in the world you live you might not be called double cream. You need the thickest cream you can find so, for example, I am sure in the USA it is called heavy cream.

I heat the cream up in the microwave in 30-second bursts until just before it is boiling. In my microwave that took around two and a half minutes. I then pour the cream on top of my chocolate. The heat from the cream will melt the chocolate. I leave it sitting for a few minutes and then stir it until it is all combined.

If there are any little bits of chocolate that haven’t melted pop the entire mixture back into the microwave on 10 second bursts until the mixture is completely melted and smooth.

If you don’t have a microwave you can also heat the cream up in a saucepan on a medium heat until it is just before boiling.

Pour the mixture into the tart tin on top of the base and smooth. Add on your delicious sweets.

For this tart, I used M&M’s, Kitkats, Edible Eyes, Reeses Peanut Butter Cups and Super Streusel Sprinkles.

The great thing about this tart is you can literally use any sweets on top that you want. So whatever your favourites are, or whatever sweets you have left over from Halloween.

Once you have added your sweets on top of the cheesecake pop it into the fridge to set completely.

Once it has set completely you can remove it from the tart tin, place it on your serving plate and enjoy!


Mixing Bowl



Tart Tin


Oreos – I used the normal chocolate Oreos for this but you can use any biscuits you want. If you are using a plain biscuit like a digestive then you will need to use half the amount of butter. You use less butter if you are using Oreos or a biscuit with chocolate so for example because the filling or chocolate will help bind the biscuits together.

Butter – I used unsalted butter but you can use this or a baking spread like Stork. The butter helps to bind the biscuits together so that they are strong enough to hold you filling.

Milk Chocolate – I used Callebaut milk chocolate but you can use any chocolate and any flavour of chocolate you want.

Double Cream – As I said above I used double cream but depending on where you live you may not have it or it might be called something else. It is basically the thickest, fattiest cream you can find. It needs to be the full fat version or the chocolate won’t set properly.

Sweets! – I used Kitkats, Reeses Peanut Butter Cups, M&Ms and Sprinkles but again you can of course use any sweets you want.

Pin it For Later!

Witches Brew Tart

Sarah Mark
This delicious Witches Brew Tart has an Oreo Biscuit Base, delicious milk chocolate ganache filling decorated with lots of Halloween treats.
4.86 from 7 votes
Prep Time 40 mins
Cook Time 4 hrs
Total Time 4 hrs 40 mins
Servings 12 people


For the Base

  • 350 g Oreos
  • 125 g Unsalted Butter, Melted

For the Filling

  • 400 g Milk Chocolate
  • 200 ml Double Cream

For the Decoration

  • Kitkats
  • Reeses Peanut Butter Cups
  • M&Ms
  • Sprinkles


To Make the Base

  • Crush your biscuits into small crumbs. I used a food processer but you could put them in a food bag and crush them with a rolling pin.
  • Oncethey are completely crushed add the butter to the food processor until thebiscuits resemble wet sand. Alternatively you could add your crushed biscuitsto a bowl and add your butter mixture.
  • Pour the mixture into your tin and press into the base and sides.

To Make the Filling and Decorate

  • Break up yourchocolate into a bowl and leave to one side.
  • In a heatproof bowladd your double cream and melt in the microwave on 30 second bursts until it isjust about to start boiling. Alterantively you can heat the cream up in asaucepan on a medium heat. You will know it is ready as there should be smallbubbles around the edge of the bowl/pan.
  • Pour the cream overthe top of your chocolate and leave for 2-3 minutes, the heat of the creamshould melt the chocolate.
  • Stir the chocolate mixture until it is completely incorporated and smooth. If there are stilllittle lumps of chocolate put the entire mixture back into the microwave on 10second  bursts until it is completely smooth.
  • Pour the mixture into your tart tin, and decorate with your sweets. Pop it into the fridge for 4-5hours or until the chocolate has completely set.
  • Remove it from thetin, place it onto your serving plate and enjoy!  


  • This will last 2-3 days covered in the fridge. 
  • The brilliant thing about this tart is you can use any chocolate you want, and you can use any of your favourite sweets on top or any sweets you have left over. 

If you do have any questions about this Witches Brew Tart recipe or any other recipes on my blog please contact me. You can either use the Facebook message symbol in the bottom right corner of your screen. Or you can send me a DM on social media or an email. You can find all my details on the right-hand side of this page. 


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