Decadent Three-Layer Brownies

These brownies are more commonly known as “slutty brownies” but I don’t like that name, so I went for “decadent three-layer brownies” instead. It’s still the same type of brownie, though: a layer of cookie dough covered by a layer of Oreos covered by a layer of brownie.

I know.

They’re as good as they sound. Interestingly, though, they taste far more delicious when they’re completely cooled down than when they’re still warm, which is counter-intuitive to me, but hey. You live, you learn.

Although there are quite a few steps, these brownies are definitely easy to make. I simply combined two of my other recipes and threw in some Oreos in between. They’re very dense and heavy, though, so I cut these into rather small pieces. But I’m not here to judge: you do you.


You’ll need…

Cookie layer (based on these cookies)

  • 125 g butter (softened)
  • 160 g light brown sugar
  • 1 egg
  • 1½ teaspoon vanilla flavouring
  • 225 g plain flour
  • ½ teaspoon baking soda
  • 1 teaspoon cornstarch
  • pinch of salt
  • 75 g chocolate chips

Oreo layer

  • 200 g Oreos (or more)

Brownie layer (based on these brownies)

  • 120 g melted butter
  • 160 g sugar
  • 2 eggs
  • 70 g plain flour
  • pinch of salt
  • 200 g dark chocolate (at least 72%)

The rest

  • parchment paper
  • a baking tin (mine is 20 x 24 cm)
  • and an oven, of course! These brownies need to be baked at 150 °C (don’t forget to preheat your oven!)

So, let’s get baking!

The Cookie Layer

1. Mix butter and sugar Put the softened butter and the light brown sugar in a bowl and mix them together until you’ve got a nice creamy consistency. Since it was late at night and I have neighbours, I used a wooden spoon, which worked perfectly for the entire recipe.

2. Add egg and vanilla flavouring Once the butter and sugar are nicely mixed together, add your egg and the 1½ teaspoon of vanilla flavouring to the mixture and mix together again.

3. Add flour, baking soda, cornstarch, salt and chocolate chips Time to add the dry ingredients. Firstly, sieve the flour above the bowl (preferably in parts) and mix it through, then add half a teaspoon of baking soda, one teaspoon of cornstarch and a pinch of salt and mix everything through. You’ll have a nice, solid dough by now. Lastly, add the chocolate chips to your dough and mix them through.

4. Transfer dough to baking tin Grease your baking tin and then line the entire thing with parchment paper (otherwise you won’t be able to get the brownie out of the tin neatly). Then put your dough into the tin and spread it over the bottom of it with your hands. Make sure it’s spread out evenly. And that’s your first layer!

The Oreo Layer

5. Cover cookie layer with Oreos Take your Oreos and cover the chocolate chip cookie layer with a layer of Oreo cookies.

The Brownie Layer

6. Melt the chocolate I usually melt chocolate au bain marie (check my original brownie recipe here on how to do that), but you can also melt it in the microwave. While the chocolate is melting, get on with the next steps.

7. Mix sugar and butter Take a bowl and mix together the sugar and butter. I always melt the butter as well (makes it much easer) but you can use softened butter as well.

8. Add eggs Add the two eggs to the mixture and mix them through.

9. Add flour and salt Now, add the flour and the salt to the mixture and mix those through as well until it’s all evenly mixed. I usually use a spoon at this point.

10. Add melted chocolate The last and most important step! Add the melted chocolate to the mixture and mix it through until you’ve got an evenly mixed batter.

11. Add batter to baking tin and bake! Pour your chocolate brownie mixture on top of the oreo layer and make sure it’s spread out evenly. Then put the tin into your preheated oven and bake these three-layer brownie for 35-40 minutes or until a skewer comes out mostly clean.

Let them cool almost completely before cutting them into pieces, and then all that’s left to do is enjoy!


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Hi! I'm Anne and I love reading, baking and writing about both of those things. Welcome!

10 thoughts on “Decadent Three-Layer Brownies

  1. My younger cousins are obsessed with these! They had me make them with oreos AND reeses peanut butter cups and those were amazing also.

    1. Wooow, adding peanut butter cups seems like a great idea! They’re not really freely available over here, though, or they cost a fortune. I’ll definitely have to incorporate them into something at some point… 🙂 Thanks for the comment – sorry for the late reply!

  2. These look delicious – never thought to combine cookies with brownies before… its genius! Thanks for sharing. Will definitely be giving these a go 🙂

  3. These look and sound sooooo amazing and decadent!! I have a friend who makes them all the time but I’ve never had them. I wish I could reach through the screen right now!

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