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Chocolate Chip Cookie Oreo Fudge Brownie Bar

Chocolate Chip Cookie Oreo Fudge Brownie Bar

Chocolate Chip Cookie Oreo Fudge Brownie Bar combines a chewy cookie base, crunchy Oreo center, and fudgy brownie top for a wildly decadent dessert. Rich, gooey, and crowd friendly, this easy to assemble treat uses familiar pantry ingredients for an impressive final result. Make it for parties, bake sales, or whenever you want a show stopping bar that is sure to disappear fast.
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Prep Time 20 minutes
Cook Time 45 minutes
Total Time 1 hour 5 minutes
Course Desserts
Cuisine American
Servings 32 bars
Calories 250 kcal

Equipment

  • 9x13-inch Baking Pan
  • Parchment Paper
  • Electric Mixer
  • Mixing Bowls
  • Spatula

Ingredients
  

  • 1 cup (227 g) unsalted butter, at room temperature Creamy and soft, provides the primary fat and tenderness to the dough while aiding in leavening and flavor development when creamed with sugars.
  • 1 cup (200 g) granulated sugar Granulated and fine, contributes sweetness and structure, helping to aerate the batter when creamed with butter for a light crumb.
  • 3/4 cup (165 g) light brown sugar Moist and caramel-like, adds depth of flavor and extra chewiness while balancing sweetness and enhancing browning in the baked bar.
  • 2 eggs Beaten and binding, supplies moisture, structure, and leavening through protein coagulation, enabling the batter to set and hold together.
  • 1 tablespoon vanilla extract Aromatic and sweet, injects warm, rounded flavor to the batter and complements chocolate and cookie components for a balanced profile.
  • 2 1/2 cups (312.5 g) all-purpose flour Starchy and structural, forms the bulk of the dry mix, provides gluten for chew and texture, and helps absorb fats and liquids evenly.
  • 1 teaspoon baking soda Leavening and lightening, reacts with acidic components to produce carbon dioxide, giving lift and a tender crumb to the cookie layer.
  • 1 teaspoon salt Flavor-balancing and preservative, enhances overall taste by suppressing bitterness and accentuating sweetness while controlling yeast activity.
  • 2 cups (360 g) milk chocolate chips, (12 ounces) Melting and chocolaty, contributes pockets of gooey chocolate throughout the bar, adding sweetness, texture contrast, and rich flavor.
  • 1 package Double Stuffed Oreos, (18-ounce) Crunchy and creamy-filled, supplies a contrasting texture and classic cookies-and-cream flavor when chopped or layered into the bars.
  • 1 Family Size 9×13 Brownie mix, (or Chewy Brownies homemade recipe) Concentrated and fudgy, offers an instant brownie base or mix for a dense, chocolaty layer that pairs with the cookie components.
  • 1/4 cup (76 ml) hot fudge topping Glossy and syrupy, supplies a sticky, fudgy topping or swirl that intensifies chocolate flavor and adds a rich finish to the bars.

Instructions
 

  • Preheat oven to 350 degrees F. Butter a 9 x 13-inch pan, line with parchment paper, and then butter the parchment paper.: The moment you scent the warm oven air you know the kitchen is primed, and that first buttery aroma sets the mood. Buttering the pan and parchment prevents sticking and helps you lift the finished slab out cleanly, which matters when slicing neat bars. If your oven runs hot, place the rack in the center to avoid overbrowning. A common mistake is skipping the parchment which can make removal difficult and cause tearing, so resist the urge to skip this step.
  • In a small bowl, whisk together the flour, baking soda and salt; set aside. Cream together the butter and both sugars in a large bowl with an electric mixer on medium speed for 3 to 5 minutes. Add the eggs and vanilla and mix well to thoroughly combine. Reduce the mixer speed to low and slowly add the flour mixture into the mixer until the flour is just combined. Stir in chocolate chips. Spread the cookie dough in the bottom of the prepared 9×13 baking dish.: As the butter and sugars cream, smell the caramel hints from the brown sugar and notice the texture change to pale and fluffy, which is exactly what you're aiming for. This aeration creates a light texture in the cookie base and helps the dough spread evenly. If you cream too briefly the dough will be dense, and if you overbeat with a hand mixer you might incorporate too much air leading to excessive spreading, so aim for that glossy, light stage.
  • Top the cookie dough with a layer of Oreos.: When you add the eggs and vanilla , the mixture smooths out and becomes slightly silkier, and the scent of vanilla will brighten everything. Room temperature eggs help this step go smoothly, preventing a broken emulsion. If the mixture looks curdled, pause and beat until uniform; chilling briefly can help if separation persists, but generally gentle, steady mixing brings it back.
  • Mix together the brownie mix according to the package directions, adding 1/4 cup of hot fudge topping to the mix. Pour the brownie batter over the cookie dough and Oreos. Bake for 45-55 minutes. Let cool completely before slicing into bars. Store leftovers in an airtight container at room temperature.: You'll feel a gentle thickening and see streaks of flour disappear into a soft dough, a critical texture that supports the layers. Overmixing develops gluten which yields a tough base, so stop as soon as the last streak vanishes. A common pitfall is adding the flour too quickly, which can create lumps, so pour gradually for an even, tender result.
  • Stir in chocolate chips.: Folding in the chocolate chips disperses pockets of melty chocolate throughout the base and gives playfulness to each bite. The dough will become studded visually, and a quick taste of raw dough should be buttery and sweet but not floury. Avoid using too many chips which might prevent the cookie layer from setting evenly, and if your chips sink during baking reduce their size slightly.
  • Spread the cookie dough in the bottom of the prepared 9×13 baking dish.: Pressing the dough into an even layer creates a consistent foundation that bakes uniformly, and you can feel the dough's density under a floured spatula as you smooth it. A perfectly even thickness helps when planning bake time, because thin spots will brown faster than thick ones. One error I often see is overworking the dough while spreading, which tightens the texture, so press gently and evenly.
  • Top the cookie dough with a layer of Oreos.: Laying the Oreos across the dough gives each bar a crunchy surprise and that signature cream stripe within the bite. Arrange them in a single snug layer so the brownie batter will cover them without leaving large gaps. A too-sparse layer changes the texture balance, and overlapping too much can create unevenness in the final slice, so aim for a neat, single coverage.
  • Mix together the brownie mix according to the package directions, adding 1/4 cup of hot fudge topping to the mix.: When you whisk the brownie mix and introduce the hot fudge , the batter becomes luxuriantly glossy and aromatic with cocoa notes, signaling a fudgy finish. The hot fudge deepens the cocoa and encourages a tender, cohesive top layer that contrasts nicely with the cookie base. Avoid overmixing which can make the brownies cakier, and if the batter seems too thick for pouring, a tablespoon of milk can loosen it slightly without compromising texture.
  • Pour the brownie batter over the cookie dough and Oreos.: As you pour, watch the batter settle into the pan and gently level itself, creating a glossy cap over the cookies. The visual cue you want is even coverage without giant pools, because that ensures a consistent bake across the surface. A frequent mistake is pouring unevenly which can expose Oreo edges and cause uneven baking, so tilt the pan slightly and nudge the batter with a spatula if needed to spread it.
  • Bake for 45-55 minutes. Let cool completely before slicing into bars.: During the bake you will notice the top develop small cracks and a slight sheen, the sign of a fudgy interior with a just set surface. The aroma will be rich and chocolate forward, and the edges will pull slightly from the pan. Cooling fully is crucial because the bars firm up as they rest, giving you clean slices; cutting too soon yields a gooey mess. If your bars are still wobbly after the listed time, allow extra cooling time rather than increasing the oven temperature which risks drying them out.
  • Store leftovers in an airtight container at room temperature.: Once cooled, these bars keep well and the flavors meld over a day, so the texture benefits from short term storage. Keep them in a single layer or separated by parchment to prevent sticking. A common storage mistake is leaving them exposed to air which dries the edges, so always seal them tightly to preserve that fresh baked softness.

Notes

  • Swap chocolate chip type Change to semi sweet or dark chocolate chips to deepen the chocolate flavor while keeping the same melting behavior, which can make the bars feel richer without impacting structure.
  • Use a homemade brownie batter Make your own chewy brownie batter for more control over cocoa intensity and texture, ensuring a fudgier top if you prefer a denser chocolate bite.
  • Press Oreos gently If you like more integrated layering, press the Oreos slightly into the cookie dough so they nestle but still keep a defined crunch after baking.
  • Add extra hot fudge Swirl an additional tablespoon of hot fudge across the top before baking for glossy pockets of intense chocolate that sing against the cookie base.
  • Cutting technique For the cleanest slices chill the baked slab for 30 to 60 minutes, then use a sharp knife dipped in hot water and wiped dry between cuts to produce neat bars.
  • Mix-in moderation If adding extra mix ins to the cookie base, scale back the chocolate chips slightly to ensure the base sets properly and the layers remain distinct.
Keyword Chocolate Chip Cookie Bars, fudge brownie recipe, Oreo brownie bars, party dessert bars