These Cookie Oreo Brownies (also known as Slutty Brownies) are the ultimate over-the-top dessert! Each bite features three irresistible layers — a chewy chocolate chip cookie base, a middle layer of Oreo cookies, and a rich, fudgy brownie topping. Made completely from scratch, this recipe is a chocolate lover’s dream and easily one of the most decadent brownie desserts you’ll ever bake.
What Are “Slutty Brownies”?
These brownies have quite the reputation online — and for good reason! Originally created in 2011 by Amanda at Kevin & Amanda, this recipe instantly went viral. It perfectly solves the age-old debate: cookies or brownies? The answer is simple — both.
By definition, these layered brownies feature:
- A chewy chocolate chip cookie layer on the bottom
- Oreo cookies in the middle (use your favorite — regular or double-stuffed)
- Fudgy brownie batter on top
The result? A dessert that’s gooey, crunchy, chocolatey, and completely irresistible.
While the internet gave them the playful name “Slutty Brownies,” I like to think of them as Cookie Oreo Brownies — indulgent and sweet by any name!
How to Make the Best Cookie Oreo Brownies
This recipe is made 100% from scratch, with easy-to-follow steps and detailed tips to ensure perfect layers every time.
Step 1: Make the Chocolate Chip Cookie Layer
- Cream the butter and sugars:
In a large bowl, beat together softened butter, brown sugar, and granulated sugar until light and fluffy. - Add wet ingredients:
Beat in one whole egg, one extra egg yolk (discard the white), and vanilla extract. The extra yolk gives the cookie base a chewy, brownie-like texture. - Add dry ingredients:
Mix in flour, baking powder, and salt on low speed until just combined. - Stir in chocolate chips:
Fold in chocolate chips with a spatula. - Press into pan:
Spoon the dough into a greased and parchment-lined 9×13-inch pan. Smooth into an even layer.
Step 2: Add the Oreo Layer
Arrange Oreo cookies in rows over the cookie dough, pressing them down gently. You’ll need about 28 Oreos — 7 rows of 4 — to cover the entire surface. If needed, cut some in half to fill gaps.
Step 3: Make the Fudgy Brownie Batter
- Melt the chocolate and butter:
In a heatproof bowl, combine butter and chopped dark (or semi-sweet) chocolate. Microwave on medium power for 45-second intervals, stirring in between, until smooth. Avoid using high power to prevent burning. - Add eggs, sugar, and vanilla:
Let the mixture cool slightly before whisking in eggs, sugar, and vanilla. (If it’s too hot, the eggs may cook.) - Mix in dry ingredients:
Whisk together flour, cocoa powder, and salt. If lumpy, sift before adding. Gently fold the dry ingredients into the chocolate mixture until just combined. - Layer it up:
Spoon the brownie batter evenly over the Oreo layer and spread it smooth. (Dropping spoonfuls first makes it easier to spread.)
Step 4: Bake and Cool
Bake in a preheated 350°F (180°C) oven for 37–45 minutes, depending on how gooey you like your brownies.
They’re done when a toothpick inserted in the center comes out with a few damp crumbs (but not wet batter).
Tip: If the center jiggles when you nudge the pan, bake a little longer.
Let the brownies cool completely before slicing — at least 4 hours. This helps the layers set for clean, perfect cuts. Patience is the hardest part, but it’s worth it!
Pan Sizes & Recipe Notes
- Full Batch: 9×13-inch pan (makes about 18 slices)
- Half Batch: 8×8-inch pan — bake 32–37 minutes
- Egg Adjustment: When halving, use 1 whole egg for the cookie layer (instead of 1 egg + 1 yolk).
Store leftovers in an airtight container at room temperature for up to 4 days.
Variations to Try
If you love this combination, here are more indulgent twists to explore:
- Oreo Brownies – Double up on chocolate and cookie flavor.
- Chocolate Chip Cookie Bars – Chewy, buttery, and simple.
- Peanut Butter Cookie Oreo Brownies – Add creamy peanut butter for a salty-sweet upgrade.
Final Thoughts
These Cookie Oreo Brownies are pure dessert heaven — thick, fudgy, chewy, and packed with layers of texture and flavor. Whether you call them Slutty Brownies or simply the best layered brownies ever, they’re guaranteed to steal the show at any gathering.