When you’re craving the best of both worlds—blondie and brownie—this layered Oreo Cookie Marble Brownie recipe will absolutely hit the spot. With gooey chocolate, crunchy Oreo cookie dough, and a touch of mini marshmallows, this treat is rich, satisfying, and surprisingly macro-aware.

Whether you follow the original rich version or opt for lighter swaps like I Can’t Believe It’s Not Butter and Swerve sugars, this recipe can be customized to your preferences.

💪 Macros per Serving

  • Calories: 253

  • Protein: 3.9g

  • Carbohydrates: 43.5g

  • Fat: 10.3g

🍫 Ingredients (Makes 16 Brownies)

  • 250g Unsalted Butter (or I Can’t Believe It’s Not Butter)

  • 100g Confectioners’ Sugar (or Swerve Confectioners)

  • 125g Brown Sugar (or Swerve Brown)

  • 300g All-Purpose Flour

  • 1 tsp Baking Powder

  • 3 Whole Eggs

  • 1 tsp Vanilla Essence

  • 50g Semi-Sweet Chocolate Chips

  • 10g Dark Cocoa Powder

  • 296g (8x cookie dough pieces) Oreo Cookie Dough (Pillsbury)

  • 20g Mini Marshmallows

Note: For a lower-calorie option, use plant-based butter alternatives and sugar-free substitutes. The richer version uses traditional butter and sugars for that classic indulgent taste.

🔥 Instructions

  1. Melt the Butter
    Gently melt the butter in a saucepan over moderate heat until smooth and fragrant.

  2. Add Sugars
    Stir in both confectioners’ and brown sugar until fully dissolved.

  3. Transfer to Mixer
    Carefully pour the mixture into a stand mixer.

  4. Incorporate Wet Ingredients
    Add eggs one at a time, along with vanilla essence. Mix until well combined.

  5. Add Dry Ingredients
    Sift in flour and baking powder, then mix until just combined.

  6. Separate & Flavor the Batters
    Pour half the batter into a bowl and set aside. Add cocoa powder to the remaining batter to make your chocolate base.

  7. Layer with Oreo Goodness
    Pour the chocolate batter into a greased square baking dish. Press in pre-portioned Oreo cookie dough across the surface.

  8. Top with Blondie Batter
    Fold chocolate chips into the reserved blondie batter and spread it gently over the Oreo layer.

  9. Finish with Marshmallows & Bake
    Sprinkle with mini marshmallows. Bake at 370°F (188°C) for about 30 minutes or until a toothpick comes out clean.

Why You’ll Love These Brownies

  • ✅ Two desserts in one: A fusion of brownie and blondie layers

  • ✅ Oreo-packed center: Adds crunch, flavor, and a nostalgic twist

  • ✅ Flexible ingredients: Can be made rich or macro-friendly

  • ✅ Quick and easy: Ready in under an hour

Ready to treat yourself? These Oreo Cookie Marble Brownies are a great choice for family gatherings, cheat-day indulgences, or just because you deserve it.

Want more recipes? Download our Biafit App for access to over 250+ of my most favorite macro-friendly recipes!

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💬 Tried it? Tag @hollytbaxter and share your brownie pics on Instagram!