Our Ultimate Slutty Brownies: The Perfect Three-Layer Indulgence

Have you ever found yourself caught in a sweet stalemate, unable to decide between a chewy chocolate chip cookie, a beloved Oreo, or a deeply satisfying fudgy brownie? It’s a delightful yet difficult position to be in. But we’re here to tell you that a choice is no longer necessary. Why pick just one when you can experience all three in a single, utterly magnificent bake?

Allow us to introduce you to the legendary Slutty Brownies, a triple-decker dessert bar that is far simpler to create than its impressive reputation suggests. This is the treat that consistently captures everyone’s imagination online, and with one bite, you’ll understand why. It represents the height of dessert luxury, a guaranteed showstopper that will have your friends and family clamouring for the recipe. Let’s get our aprons on and make this masterpiece together.

What Exactly Are Slutty Brownies?

Before we dive into the baking, let’s explore what makes this particular dessert so wonderfully unique. The name might be a little cheeky, but it perfectly conveys the wonderfully excessive, no-compromise character of the bake. Each bar is a glorious tower of textures and tastes, composed of three distinct layers that come together in perfect harmony:

• The Base Layer: A soft, buttery chocolate chip cookie dough that provides the perfect chewy foundation for the treats to come.
• The Middle Layer: An entire layer of Oreo biscuits, nestled in the centre. As they bake, they soften into a cake-like consistency, infusing the bar with that classic cookies-and-cream magic.
• The Top Layer: A rich and decadent, dark chocolate brownie batter that blankets the Oreos and bakes to form a beautifully crackled top.

When these three layers are baked, they merge into a unified bar of pure indulgence. The combination of textures and flavours is truly extraordinary. While some may know them by other names like “Oreo Stuffed Brownies” or “Ultimate Cookie Bars,” the memorable title has certainly stuck, perfectly suiting this sinfully delicious creation.

Why You’ll Love This Recipe

• The Best of Three Worlds: This is the dream dessert for the indecisive. It fulfils cravings for cookies, Oreos, and brownies all in one go!
• Effortlessly Impressive: Despite looking like a complex bake, this recipe relies on simple ingredients and very straightforward steps. You don’t need any special baking skills.
• A Guaranteed Crowd-Pleaser: Take a batch of these to any social gathering, potluck, or party, and watch them vanish. You’ll instantly be everyone’s favourite baker.
• Pure Decadence: This is a decadent dessert crafted for moments of pure enjoyment. It’s the ideal comfort bake for when you need a truly special treat.
• Endlessly Adaptable: As we’ll explore further on, this recipe serves as a brilliant starting point for all sorts of creative twists using your favourite biscuits and mix-ins.

Ingredients You’ll Need for Perfect Slutty Brownies

For the most delicious results, we truly believe that making each layer from scratch is the way to go. It requires very little extra effort, but the improvement in taste is enormous! Here is a breakdown of what you will need for each component.

For the Chocolate Chip Cookie Dough Layer

• 125g unsalted butter, softened
• 100g light brown soft sugar
• 75g caster sugar
• 1 large free-range egg
• 1 tsp vanilla extract
• 180g plain flour
• ½ tsp bicarbonate of soda
• ¼ tsp salt
• 150g chocolate chips (milk or dark)

For the Middle Layer

• 1 packet (around 154g) of Oreo biscuits

For the Fudgy Brownie Layer

• 150g unsalted butter, cubed
• 150g dark chocolate (70% cocoa solids), chopped
• 200g caster sugar
• 3 large free-range eggs
• 1 tsp vanilla extract
• 90g plain flour
• 40g unsweetened cocoa powder
• ¼ tsp salt

Step-by-Step Instructions for Making Slutty Brownies

Are you ready to assemble this epic treat? Just follow our simple steps for a flawless result. And remember, allowing them to cool properly is the key to achieving those perfect, clean slices!

1. Get Your Tin Ready: First, preheat your oven to 180°C (160°C Fan/Gas Mark 4). Thoroughly grease a 23cm (9-inch) square baking tin, then line it with baking parchment, ensuring you leave some paper overhanging the sides. This handy overhang will work like a sling, making it much simpler to lift the whole bake out later.
2. Create the Cookie Dough: In a large mixing bowl, use an electric mixer to cream the softened butter with both the light brown and caster sugars until the mixture is pale and airy. Add the egg and vanilla extract and beat again. In a separate bowl, stir the plain flour, bicarbonate of soda, and salt together. Add these dry ingredients to your wet mixture in stages, mixing on a low speed until just incorporated. To finish, gently fold through the chocolate chips.
3. Form the Cookie Base: Transfer the cookie dough into your lined tin. Use your fingertips or the back of a spoon to press it down into a smooth, even layer that covers the entire base.
4. Arrange the Oreo Layer: Place the Oreo biscuits in a neat, single layer across the cookie dough. Press them down gently to ensure they adhere to the dough beneath.
5. Prepare the Brownie Batter: Put the cubed butter and chopped dark chocolate in a heatproof bowl. Set this bowl over a saucepan of gently simmering water to create a bain-marie. As advised by BBC Good Food, it’s crucial that the bowl doesn’t touch the water. Stir periodically until everything has melted into a glossy, smooth mixture. Take it off the heat and allow it to cool slightly for a few minutes.
6. Complete the Batter: Whisk the caster sugar into the slightly cooled chocolate mixture. Next, add the eggs one by one, whisking well after each addition, followed by the vanilla extract. Finally, sift in the plain flour, cocoa powder, and salt. Gently fold these dry ingredients through the mixture until you have a smooth batter. Take care not to overmix at this stage!
7. Pour and Cover: Pour the finished brownie batter over the layer of Oreos. Use a spatula to carefully spread it out, making sure it covers all the biscuits and extends to the corners of the tin.
8. Time to Bake: Place the tin into your preheated oven and bake for 30–35 minutes. To check if it’s done, insert a cocktail stick or skewer into the centre. It should emerge with moist, fudgy crumbs clinging to it, rather than wet batter. It’s always better to be slightly underdone than overdone with these.
9. Cool Down Completely: This is arguably the most vital step! You must allow the triple-layer brownies to cool entirely in the tin. This will take a minimum of 3-4 hours at room temperature. For exceptionally neat slices, place the tin in the fridge for an hour once it has cooled to room temperature.

Top Tips for the Best Slutty Brownies Ever

We want your baking adventure to be a complete success. Keep these pointers in mind to guarantee a truly spectacular outcome.

• Resist the Urge to Overbake: The secret to a perfectly gooey, fudgy brownie layer is to remove it from the oven at just the right time. The residual heat within the tin will continue to bake it as it cools down.
• The Best Ingredients Yield the Best Results: Opting for good quality dark chocolate (with at least 70% cocoa solids) and real butter will significantly enhance the final taste and texture of your bake.
• Patience is Everything: We cannot say this enough—let them cool fully! If you try to slice them while they’re still warm, you’ll end up with a delicious but very messy heap of chocolate. Use the parchment sling to remove the entire slab before you attempt to cut it.
• Use Room Temperature Ingredients: For the cookie dough base, make sure your butter and egg are at room temperature before you start. This allows them to emulsify properly, which leads to a superior texture.

Variations and Substitutions

While the classic version is simply heavenly, we encourage you to get creative! This recipe is a wonderful canvas for your culinary experiments.

• Switch Up the Biscuits: Not a fan of Oreos? That’s no problem at all! You could swap them for Biscoff biscuits, Custard Creams, Bourbons, or even Jammie Dodgers to introduce a fruity element.
• Play with Chocolate: Try using milk chocolate chunks, white chocolate chips, or a combination in your cookie dough layer. Peanut butter chips also make for a fantastic, nutty addition.
• Introduce a Swirl: Just before baking, add a few dollops of salted caramel sauce, Biscoff spread, or smooth peanut butter to the top of the brownie batter. Use a skewer or knife to gently create a marbled effect for another dimension of flavour.

If you enjoy making indulgent traybakes, we think you’ll also adore our Biscoff Rice Krispie Treats, which offer a different kind of gooey, no-bake satisfaction. For something with a zesty, fruity contrast, our Lemon Cheesecake Crumb Bars are an absolute must-try.

How to Store Your Brownies

In the unlikely event that you have any leftovers, storing them couldn’t be easier. Once sliced, place the brownies in an airtight container and keep them at room temperature. They will remain fresh and tasty for up to 5 days.

They also freeze exceptionally well! To store them for longer, wrap individual squares tightly in cling film before placing them in a freezer-safe bag or container. They can be frozen for up to 3 months. When you’re ready for a treat, simply let them thaw at room temperature for a couple of hours.

FAQ

Conclusion: Your New Favourite Indulgent Treat

And there we have it—your complete guide to creating the most sensational Oreo brownies you’ve ever had the pleasure of tasting. This recipe is wonderful proof that sometimes, more really is more. The glorious fusion of a chewy cookie base, a creamy Oreo centre, and a rich brownie topping creates a masterpiece of texture and flavour that is surprisingly easy to achieve at home.

So, why wait? It’s time to gather your ingredients and prepare to bake the dessert that everyone will be talking about. We can assure you, one taste of these spectacular Slutty Brownies and you’ll be smitten for life.

We would be delighted to see how yours turn out! Please leave a comment below to share your experience or any inventive twists you came up with. Happy baking!

Mouthwatering Slutty Brownies with Oreo Filling

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A truly decadent bake featuring a chewy cookie base, a layer of classic Oreos, and a rich, fudgy brownie topping. This is the ultimate treat for any occasion!

Prep Time: 20 Minutes
Cook Time: 35 Minutes
Total Time: 55 Minutes
Servings: 16 Squares

Ingredients

• For the Cookie Dough Layer:
• 125g unsalted butter, softened
• 100g light brown soft sugar
• 75g caster sugar
• 1 large free-range egg
• 1 tsp vanilla extract
• 180g plain flour
• ½ tsp bicarbonate of soda
• ¼ tsp salt
• 150g chocolate chips
• For the Middle Layer:
• 1 packet (154g) Oreo biscuits
• For the Brownie Layer:
• 150g unsalted butter, cubed
• 150g dark chocolate (70% cocoa)
• 200g caster sugar
• 3 large free-range eggs
• 1 tsp vanilla extract
• 90g plain flour
• 40g unsweetened cocoa powder
• ¼ tsp salt

Instructions

1. Preheat your oven to 180°C (160°C Fan) and line a 23cm (9-inch) square tin.
2. Make the cookie dough by creaming the butter and sugars, then beating in the egg and vanilla. Mix in the dry ingredients, then fold in the chocolate chips.
3. Press the cookie dough evenly into the base of your prepared tin.
4. Arrange the Oreo biscuits in a single layer on top of the cookie dough.
5. Make the brownie batter by melting the butter and dark chocolate together. Whisk in the sugar, followed by the eggs and vanilla. Fold in the flour, cocoa, and salt.
6. Pour the brownie batter over the Oreos and spread it evenly to the edges.
7. Bake for 30-35 minutes, or until a skewer inserted into the centre comes out with moist crumbs.
8. Allow to cool completely in the tin (at least 3-4 hours) before lifting out and slicing.

Nutrition (per serving):
Calories: 452 kcal
Protein: 5g
Carbs: 55g
Fat: 23g