Oreo Brookie Layer Cake

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This Oreo Brookie Layer Cake is made with layers of chocolate chip cookie, Oreo cake and a wonderfully fudgy brownie! I’s hands down my new favorite cake – I can’t get enough!

Oreo Brookie Layer Cake recipe

Oreo Brookie Layer Cake

So since announcing that my cookbook is available for preorder Monday, it has been so much fun seeing everyone’s response to the cover and the details I’ve been able to share. The book is officially a top new release in “dessert baking” on Amazon and I have so many of you to thank for that. It’s amazing and has made this a wonderful week for me!

If you entered the giveaway, then you know that to enter you just had to answer a question about what part of the book you are most looking forward to. It has been so much fun reading through those responses. I’d say it’s just about evenly split between all the chapters and I love that so many of you are looking forward to the tutorials. 🙂 Plus, many of you wrote additional notes about how much you’ve enjoyed the blog and the recipes you’ve made and all the sweet words literally brought tears to my eyes. Thank you!! It makes all the hard work worth it to know that so many of you enjoy the things I share.

Many of you also noted that you are big fans of the unusual cake combinations that I come up with, so it couldn’t be more perfect that I had this cake planned to share with you today! It’s hard to say that it’s my craziest, because I’ve had some crazies, but it should be added to the list of the over-the-top awesome cakes here on this blog. 🙂

Best Oreo Brookie Layer Cake
Best Oreo Brookie Cake recipe

This Oreo Brookie Layer Cake combines so many amazing things in one – chocolate chip cookie, cake, Oreos and brownie. Like, what more could you want?

It takes a bit of time because you have to make and bake each layer separately, unlike a cake that you make one batter for. But it’s totally worth it! Seriously, it seems like it’d be a super heavy cake (and it certainly weighs plenty!) but as far as eating it – it’s not as heavy as you’d expect. I took some with me when I went with a group of girlfriends to go see “Bad Moms” and they were all dying over it. They all agreed that it wasn’t too heavy and they were just as in love with it as I was. 🙂

Tips for Making an Oreo Brookie Layer Cake

So let’s talk a bit about making and building this baby. The cookie on the bottom is my usual cookie cake. I love it on it’s own and I love it in this cake. Like with all of my cookie cakes, you don’t want to over bake it. It’ll look a little under cooked in the middle when you take it out of the oven, but it will continue to cook and firm as it cools. The edges should be nice and golden though. I let it cool completely in the pan so that the center is nice and firm before I remove it.

Next is the brownie. I actually made the cookie and brownie one day and then made the Oreo cake and finished the cake the following day, to break things up. The brownie is wonderfully fudgy! It’s made with melted chocolate, which helps gives that extra-fudgyness. Be careful not to over bake it, which can happen easily. You want to bake it until a toothpick comes out with some moist crumbs still stuck to it. Unlike a cake, they’ll be fudgier, stickier crumbs so don’t wait for them to look like a cake’s crumbs – they won’t and then you’ll over bake it.

Homemade Oreo Brookie Layer Cake
Favorite Oreo Brookie Layer Cake

The final layer is the Oreo cake. It’s a denser cake than some, but that was on purpose. For the Oreos to not all sink to the bottom, I needed a dense cake. And given the density of the cookie and brownies, a cake that’s too light would’ve been a little off here. This cake layer is easy to put together – no need to worry about creaming – and it’s super delicious.

Once all the layers are made, the cake is frosted with chocolate buttercream. There are some additional crushed Oreos between the cake layers, because you can never have too many. To finish it off, it’s got a beautiful chocolate ganache drizzle down the sides and some chocolate chip cookies and Oreos adorning the top. I mean, come one. This cake is SO FUN! And it’s delicious too! We’re more than 4 months away from my birthday, but I’m thinking this sucker might make an appearance. It’s that good.

AND! I made a video of myself putting the Oreo Brookie Layer Cake together so you can see how it all works. The video is below – I hope you like it and find it helpful! 🙂

Easy Oreo Brookie Layer Cake
[adthrive-in-post-video-player video-id=”AJ49DvGF” upload-date=”Fri Aug 05 2016 00:45:52 GMT+0000 (UTC)” name=”How to decorate the brookie layer cake” description=”How to decorate the brookie layer cake”]
For the full tutorial on frosting the cake smoothly, check out my tutorial and video on how to frost a smooth cake with buttercream.
Read transcript

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slice of Oreo Brookie Layer Cake

Oreo Brookie Layer Cake

  • Author: Lindsay Conchar
  • Prep Time: 30 minutes
  • Cook Time: 1 hour 35 minutes
  • Total Time: 2 hours 5 minutes
  • Yield: 14-16 Slices
  • Category: Dessert
  • Method: Oven
  • Cuisine: American


This Oreo Brookie Layer Cake is made with layers of chocolate chip cookie, Oreo cake and a wonderfully fudgy brownie! I’s hands down my new favorite cake – I can’t get enough!


Chocolate chip cookie cake

  • 3/4 cup (169g) unsalted butter, room temperature
  • 3/4 cup (108g) brown sugar
  • 1/4 cup (52g) sugar
  • 1 egg
  • 2 tsp vanilla extract
  • 2 cups (260g) all purpose flour
  • 2 tsp cornstarch
  • 1 tsp baking soda
  • 1/2 tsp salt
  • 1 1/4 cups semi-sweet chocolate chips


  • 1/2 cup (112g) unsalted butter
  • 6 oz chopped quality semi sweet chocolate
  • 1 1/4 cups (259g) sugar
  • 1 1/2 tsp vanilla extract
  • 3 large eggs
  • 3/4 cup (98g) flour
  • 2 tbsp natural unsweetened cocoa
  • 1/4 tsp salt

Oreo cake

  • 1 2/3 cups (217g) all purpose flour
  • 1 cup (207g) sugar
  • 1 1/4 tsp baking powder
  • 1/2 tsp salt
  • 3 egg whites, room temperature
  • 1/2 cup (115g) sour cream, room temperature
  • 1/2 cup (120ml) milk, room temperature
  • 2 tsp vanilla extract
  • 3/4 cup (168g) unsalted butter, melted and slightly cooled
  • 1/2 cup (61g) oreo crumbs
  • 6 Oreos, chopped

Chocolate buttercream

  • 1 1/2 cups (336g) butter
  • 1 1/4 cups (237g) shortening
  • 9 3/4 cups (1121g) powdered sugar
  • 2 tsp vanilla extract
  • 1 1/4 cup (123g) natural unsweetened cocoa powder
  • 56 tbsp (60-75ml) water/milk


  • 10 Oreos, crushed
  • 4 oz semi sweet chocolate chips
  • 5 tbsp (75ml) heavy whipping cream
  • Chocolate chip cookies, for decorating
  • Oreos, for decorating


To make the cookie cake

  1. Preheat oven to 350 degrees. Place parchment paper in the bottom of a 9 inch cake pan and grease the sides.
  2. Cream butter and sugars together until light and fluffy, about 3-4 minutes.
  3. Mix in egg and vanilla extract.
  4. Combine dry ingredients in a another bowl, then add them to the butter mixture and mix until well combined. Dough will be thick.
  5. Stir in chocolate chips.
  6. Press the dough evenly into the cake pan.
  7. Bake for 21-24 minutes or until the edges are slightly golden. The center will look undercooked, but it will continue cooking and firm up as it cools.
  8. Remove from oven and set aside to cool completely in the cake pan. It may still look a little undercooked until completely cool and firm. Once cooled, the center should be firm and it’ll be easier to remove it from the pan without it falling apart.

While the cookie cake cools, make the brownie

  1. Preheat oven to 350 degrees. Place parchment paper in the bottom of a 9 inch cake pan and grease the sides.
  2. To make the brownie, add the butter and chocolate to a heat-proof bowl (I use my mixer bowl) and set it over a pot of simmering water. Melt the butter and chocolate, stirring until smooth. Set aside to cool a bit.
  3. Whisk together the sugar, vanilla extract and eggs in a medium bowl until well combined.
  4. Combine the dry ingredients in another medium bowl.
  5. Whisk the cooled chocolate mixture into the egg mixture and combine.
  6. Gently stir the flour mixture into the chocolate mixture until well combined.
  7. Pour the batter evenly into the prepared pan and bake for 35-38 minutes, or until a toothpick inserted comes out with a few sticky crumbs. You don’t want to over bake it.
  8. Remove brownie from oven and set aside to cool completely in the pan, then remove from the pan.

While the brownie cools, make the Oreo cake

  1. Preheat oven to 350 degrees. Place parchment paper in the bottom of a 9 inch cake pan and grease the sides.
  2. Whisk together flour, sugar baking powder and salt in a large mixing bowl.
  3. Whisk together egg whites, sour cream, milk and vanilla extract in a medium bowl, then add to the flour mixture and mix on medium speed just until smooth.
  4. Add melted butter and mix until combined.
  5. Stir in the Oreo crumbs and chopped Oreos.
  6. Pour batter evenly into prepared cake pan and bake for 34-36 minutes, or until a toothpick inserted in the center comes out with a few crumbs.
  7. Remove cake from oven and allow to cool for 2-3 minutes, then remove from pan to a cooling rack to finish cooling.

When the cake layers are ready, make the frosting

  1. Beat the butter and shortening together until smooth.
  2. Slowly add about half of the powdered sugar, mixing until smooth between each addition of powdered sugar.
  3. Add the vanilla extract, cocoa powder and 4 tablespoons of water or milk to the frosting and mix until smooth.
  4. Slowly add the remaining powdered sugar, mixing until smooth between each addition of powdered sugar.
  5. Add additional water to the frosting as needed to get a smooth consistency.

Put it all together

  1. Use a large serrated knife to remove the top edges from the cookie cake so that it’s flat and remove the dome from the top of the oreo cake. If the top of the brownie isn’t flat, trim it so that it is. See my tips on how to level a cake.
  2. Place the cookie cake on a serving plate or cardboard cake circle and top with about 1 cup of frosting. Smooth frosting into an even layer.
  3. Add about half of the additional crushed Oreos on top of the frosting and press into the frosting.
  4. Add the Oreo cake and top with about 1 cup of frosting. Smooth frosting into an even layer.
  5. Add remaining half of the additional crushed Oreos on top of the frosting and press into the frosting.
  6. Add the brownie to the top of the cake.
  7. Add a crumb coat and frost the outside of the cake. For help with getting a smooth cake, refer to my tutorial on how to frost a smooth cake with buttercream.
  8. Pipe swirls around the top edge of the cake. I use Ateco tip 844, but Wilton 2D or 1M would work as well.
  9. To make the chocolate ganache, add the additional chocolate chips to a heat proof bowl (see my tips on making chocolate ganache).
  10. Microwave the heavy whipping cream until boiling, then pour over the chocolate chips. Cover the bowl with clear wrap for about 5 minutes, then whisk until smooth.
  11. Use a spoon to drizzle the chocolate ganache down the sides of the cake. See my tips on making a chocolate drip cake.
  12. Pour remaining ganache onto the top of the cake and spread into an even layer in the middle of the piped swirls.
  13. Finish the cake off with chocolate chip cookies and Oreos that have been cut in half.


If this cake will be eaten within a day or two, I’d store it in an air-tight container at room temperature. If it will sit for longer than that, I’d refrigerate it.


  • Serving Size: 1 Slice
  • Calories: 1266
  • Sugar: 129.8 g
  • Sodium: 520.1 mg
  • Fat: 64.8 g
  • Carbohydrates: 169.8 g
  • Protein: 12.1 g
  • Cholesterol: 116.9 mg

Keywords: brookie cake, cookie brownie cake, oreo brownie cake

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Oreo Brookie Layer Cake - a layer of chocolate chip cookie cake, oreo cake, and a fudgey chocolate brownie! All my favorite things in one AMAZING cake!

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  1. Rashmi

    Can I make this a 7 inch or 8 inch cake tins and stack it up. Then  Frost it with a firm chocolate frosting and covering with fondant . Can it be done?

    1. Lindsay

      I haven’t done that, so I can’t say for sure. Certainly you’d end up with thicker layers, so you’d need to bake them for longer.

  2. Affan

    Hi Lindsay I am making this mouthwatering cake tomorrow and it looks absolutely scrumptious
    I just had one question I have a 90g chocolate bar is that enough for the brownie layer cake

  3. Hanah

    Hi My sister does not like Oreos, so I was wondering if I replace the Oreos with the walnuts would I need to find another cake recipe, or could I just follow this one and just add walnuts instead of Oreos

  4. ilana

    Hi Lindsay!

    If i were to make the cookie layer one day in advance would you suggest wrapping it in saran wrap and freezing it overnight and then letting it thaw or simply leaving it wrapped and out on the counter until next day?

    Thank you!

About Lindsay

I'm a wife and a mom to twin boys and a baby girl! And I've got a serious sweets addiction! Bring on the treats!

Scripture I’m Loving

“Come to me, all you who are weary and burdened, and I will give you rest. Take my yoke upon you and learn from me, for I am gentle and humble in heart, and you will find rest for your souls.” Matthew 11:28-29