Cookie Dough Oreo Brownies

This is hands down the most over-the-top dessert I make. It settles the old debate of cookies versus brownies by just using both, with a chewy chocolate chip cookie base, a layer of whole Oreos in the middle, and fudgy brownie on top. The first time I made these, I sliced into them while they were still warm because I couldn’t wait, and the layers smooshed into a gooey mess instead of clean squares. Letting them cool fully is the hardest but most important step.

What I love is that it’s three desserts in one and all from scratch. The cookie layer is chewy and a little dense, almost like a blondie, the Oreos add that creamy crunch in the middle, and the brownie on top uses both melted chocolate and cocoa for a rich, fudgy finish. They’re thick and indulgent, the kind of thing that disappears fast at a party.

Here’s the kitchen tip for the cookie layer. Use one whole egg plus an extra yolk, not two full eggs. That extra yolk without the white is what makes the cookie base extra chewy and dense, more like the texture of a brownie. There’s also barely any baking powder in it for the same reason, so the layer stays fudgy instead of puffing up like a regular cookie.

And melt the chocolate for the brownie layer gently, which is where people often go wrong. Microwave the butter and chopped chocolate in 45-second bursts on medium power, never high, stirring between each. High power can make the chocolate grainy or burn it. Then let it cool a few minutes before whisking in the eggs, since hot chocolate can actually scramble them. You’ll smell that deep chocolate thing as it bakes, then resist slicing until it’s fully cool.

Why You’ll Love This Recipe

It’s three desserts in one. A chewy cookie base, a whole Oreo layer, and a fudgy brownie top stacked into every square.

The texture has it all. Dense chewy cookie, creamy crunchy Oreo, and rich fudgy brownie give you contrast in every bite.

It’s 100% from scratch. Both layers are homemade, with melted chocolate and cocoa for deep, fudgy flavor.

It’s a showpiece dessert. Thick and indulgent, these always get a reaction when you set them out.

Ingredients

Here’s everything you’ll need:

For the chocolate chip cookie layer:

• 3/4 cup unsalted butter, softened
• 1/2 cup brown sugar
• 1/2 cup white sugar
• 1 large egg
• 1 large egg yolk (discard the white)
• 1 teaspoon vanilla extract
• 1 1/2 cups all-purpose flour
• 1/4 teaspoon salt
• 2/3 cup chocolate chips

For the Oreo layer:

• 28 Oreo cookies

For the brownie layer:

• 1/2 cup unsalted butter, cubed
• 6 oz dark chocolate (50 to 70%) or semi-sweet
• 1 cup granulated sugar
• 2 large eggs
• 1/2 cup all-purpose flour
• 1/4 cup cocoa powder
• 1/2 teaspoon salt

How to Make Cookie Dough Oreo Brownies

1. Prep the Pan

Heat the oven to 350. Grease a 9×13 pan, then line it with parchment leaving an overhang on the sides. The overhang makes lifting the cooled bars out clean and easy later.

2. Make the Cookie Layer

Beat the butter, brown sugar, and white sugar until combined. Beat in the egg, extra yolk, and vanilla. On low, mix in the flour and salt, then stir in the chocolate chips. Spoon it into the pan and smooth it flat.

3. Add the Oreos

Lay the Oreos over the cookie dough, pressing them down lightly. Use about 7 rows of 4, plus a few halves to cover the gaps. This is the creamy crunchy middle layer.

4. Make the Brownie Batter

Melt the chopped chocolate and butter in 45-second bursts on medium power, stirring between each. Cool it about five minutes, then whisk in the eggs and sugar. Whisk in the sifted flour, cocoa, and salt until just combined.

5. Layer and Bake

Spoon the brownie batter over the Oreos in dollops, then spread it smooth. Bake for 37 to 45 minutes, until a toothpick comes out with a few damp crumbs. The middle shouldn’t wobble.

6. Cool and Slice

Let the bars cool fully, at least four hours, before slicing. Lift them out with the parchment overhang, set them on a board, and cut into squares.

Expert Tips

Use one egg plus an extra yolk for the cookie layer. The extra yolk makes it chewier and denser.

Melt the chocolate on medium power, not high. High heat can make the chocolate grainy or burn it.

Cool the melted chocolate before adding eggs. Hot chocolate can scramble the eggs in the batter.

Spoon the brownie batter on in dollops. It’s easier to spread evenly over the Oreos than pouring it all in the middle.

Let them cool fully before slicing. At least four hours gives you clean squares instead of a gooey mess.

Recipe Variations and Add-ins

You can use double-stuffed Oreos in the middle layer for an even creamier center.

Swap in a flavored Oreo like mint or peanut butter for a different middle layer.

You can halve the recipe and bake it in an 8×8 pan, using just one whole egg for the cookie layer.

Sprinkle a little flaky sea salt over the brownie batter before baking for a sweet-salty edge.

You can drizzle melted chocolate over the cooled bars for an extra finish.

What to Serve With This Recipe

Serve a square with a scoop of vanilla ice cream. The cold cream offsets the rich bars. The two go hand in hand.

Pair them with a glass of cold milk. The milk cuts the sweetness. It’s a classic combo for chocolate desserts.

Set them out at a party on a dessert tray. The thick bars stand out. They’re easy to grab and eat.

How to Store This Recipe

Store the bars in an airtight container at room temperature for up to four days. They stay fudgy and chewy, and the flavors settle in nicely after the first day.

You can also freeze the cut squares, wrapped well, for longer storage. Thaw them at room temperature when you’re ready, and they’re just as good.