There are certain bakes that exist in a category all their own, sitting somewhere between impressive and pure indulgence. These Brownie Cookie Sandwiches With Cookie Dough Buttercream are firmly in that camp. Imagine the best of both worlds: a rich, fudgy brownie with the classic, chewy texture of a cookie, then sandwich two of them together with a buttercream that tastes exactly like the forbidden spoonful of raw cookie dough we all sneak from the bowl. This is my go-to recipe when I need something that looks spectacular but is built on straightforward techniques.

What makes this dessert recipe so special is the contrast in textures and flavours. The brownie cookies have that signature crackly top and intensely chocolatey, gooey centre, thanks to a generous amount of dark chocolate. They’re soft, but sturdy enough to hold their own. And the filling? It’s not just a standard vanilla buttercream. We heat-treat the flour to make it perfectly safe to eat, then whip it with butter, brown sugar, and vanilla to create a smooth, slightly gritty (in a good way!) filling studded with miniature chocolate chips. It’s nostalgia in a mouthful.

This is a recipe for those moments when only a truly decadent treat will do. It works beautifully for a special birthday, an afternoon tea with friends, or simply as a weekend baking project when you want to create something memorable. Everyone seems to love this combination, and it’s a brilliant way to elevate a simple cookie into a show-stopping dessert.

Recipe Overview

This recipe brings together two beloved bakes into one glorious treat. You’ll first make the brownie cookies, which are essentially drop-style brownies with a rich cocoa base and melted chocolate. While they cool, you’ll whip up a silky, no-bake cookie dough buttercream. The final assembly is the best part! From my own testing, I’ve found that letting the assembled sandwiches chill for just 20 minutes in the fridge helps the buttercream set, making them much neater to eat.

• Prep Time: 25 minutes
• Cook Time: 12 minutes
• Total Time: 37 minutes (plus cooling)
• Servings: 12 sandwiches
• Difficulty: Medium

Why You’ll Love This Brownie Cookie Sandwich Recipe

• Genuine Flavour: The deep, slightly bitter notes from the 70% dark chocolate in the cookies are perfectly balanced by the sweet, brown-sugar-and-vanilla warmth of the cookie dough buttercream. It’s a truly satisfying combination.
• Ready in Under an Hour: The entire process, from mixing the batter to having the cookies out of the oven, comes together in about 40 minutes. The buttercream is even faster, meaning you can have these assembled and ready to chill in no time.
• Flexible Recipe: Feel free to add 50g of chopped walnuts or pecans to the brownie cookie batter for a bit of crunch. You can also swap the mini milk chocolate chips in the buttercream for dark chocolate or even butterscotch chips.
• Great for Sharing: These are ideal when you’re asked to bring a dessert to a party or a family gathering. They travel well and always get compliments.
• Family Tested: My kids absolutely adore these. They love helping pipe the buttercream and, of course, being the first to taste-test the finished cookie sandwiches.

Brownie Cookie Sandwiches With Cookie Dough Buttercream

⏱️ 30 min prep  •  🍳 20 min cook  •  👥 12 servings

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Ingredients You’ll Need

For the best results, use good quality ingredients, especially the chocolate and cocoa powder. It makes a world of difference to the final flavour. I often use Green & Black’s 70% cooking chocolate as it melts beautifully and has a fantastic depth. For the cocoa, a Dutch-processed powder will give you a darker, less acidic brownie cookie.

• For the Brownie Cookies:
• 125g unsalted butter, cubed
• 150g dark chocolate (70% cocoa solids), roughly chopped
• 2 large free-range eggs, at room temperature
• 175g light brown soft sugar
• 1 tsp vanilla extract
• 75g plain flour
• 25g cocoa powder
• 1/4 tsp bicarbonate of soda
• Pinch of salt
• For the Cookie Dough Buttercream:
• 60g plain flour
• 125g unsalted butter, softened
• 100g light brown soft sugar
• 50g icing sugar, sifted
• 1 tsp vanilla extract
• 2 tbsp milk
• Pinch of salt
• 75g miniature milk chocolate chips

Adam’s Tip: Ensure your butter for the buttercream is properly softened to room temperature, but not melty. This is key to achieving a light, fluffy, and non-greasy texture. If it’s too cold, the buttercream can become lumpy.

How to Make Brownie Cookie Sandwiches With Cookie Dough Buttercream

We’ll tackle this in two main stages: baking the cookies, then making the filling while they cool. The process is straightforward, just be sure to give the cookies plenty of space on the baking tray as they will spread a little.

1. Preheat your oven to 180°C (160°C fan) and line two large baking trays with parchment paper.
2. First, make the brownie cookies. Place the cubed butter and chopped dark chocolate in a heatproof bowl set over a small saucepan of simmering water (a bain-marie). Stir occasionally until completely melted and smooth. Set aside to cool for 5-10 minutes.
3. In a separate large bowl, using an electric hand mixer or a stand mixer with the whisk attachment, beat the eggs and light brown sugar together for 3-4 minutes until pale, thick, and voluminous. Whisk in the vanilla extract.
4. Gently pour the cooled chocolate mixture into the egg mixture and fold it through with a spatula until just combined. Be careful not to knock out too much air.
5. Sift the plain flour, cocoa powder, bicarbonate of soda, and a pinch of salt over the wet ingredients. Fold everything together until no floury streaks remain. The batter will be thick and glossy.
6. Drop heaping tablespoons of the batter onto your prepared baking trays, leaving at least 5cm of space between each one to allow for spreading. I find that using a medium ice cream scoop gives you perfectly uniform cookies, which is ideal for sandwiches. You should get about 24 cookies.
7. Bake for 10-12 minutes. The edges should be set and the tops will be cracked and shiny, but the centre should still be slightly soft. They will firm up as they cool. Leave them on the tray for 5 minutes before transferring them to a wire rack to cool completely.
8. While the cookies are cooling, make the buttercream. First, heat-treat the flour to kill any bacteria. Spread the flour on a baking tray and bake at 180°C (160°C fan) for 5 minutes, or microwave on high for 60-90 seconds until it reaches 74°C. Let it cool completely.
9. In a large bowl, beat the softened butter with an electric mixer until light and creamy. Add the light brown sugar and icing sugar and beat again for 3-5 minutes until very pale and fluffy.
10. Add the cooled flour, vanilla, milk, and salt, and beat on a low speed to combine, then increase the speed and beat for another 2 minutes until smooth. Fold in the miniature chocolate chips.
11. To assemble, pair up the cooled brownie cookies by size. Pipe or spoon a generous amount of the cookie dough buttercream onto the flat side of one cookie, then gently press another cookie on top to create your sandwich. Repeat with the remaining cookies.

Tips From My Kitchen

• Temperature Control: For the buttercream, having your butter at the perfect room temperature is non-negotiable for a silky-smooth finish. Similarly, using room temperature eggs for the cookies helps them emulsify with the sugar, creating a lighter, more stable batter.
• The Secret Step: For extra thick brownie cookies, chill the scooped dough on the baking tray for 15-20 minutes before baking. I learned that this small step solidifies the butter, which dramatically reduces spread in the oven. You can learn more about the science behind this on sites like Serious Eats.
• Make-Ahead: The brownie cookies can be baked up to 2 days in advance and stored in an airtight container. The buttercream can also be made a day ahead and kept in the fridge; just let it come to room temperature and give it a quick whip before using.
• Storage: Once assembled, the brownie cookie sandwiches are best stored in an airtight container in the fridge for up to 4 days. Let them sit at room temperature for 15 minutes before serving for the best texture.

Equipment You’ll Need

• Stand mixer or electric hand mixer
• 2 large baking trays
• Parchment paper
• Wire cooling rack
• Piping bag with a round nozzle (optional, for assembly)

Common Mistakes to Avoid

• Overcrowding the Pan: Don’t be tempted to squeeze too many cookies onto one tray. They need air to circulate for even baking, and they will spread. Stick to 8-10 per large tray to ensure they bake perfectly without merging into one giant cookie.
• Wrong Temperature: An oven that’s too hot will cause the cookies to burn on the outside before the inside is cooked. An oven that’s too cool will cause them to spread too much. Use an oven thermometer to ensure your temperature is accurate.
• Skipping the Cooling Time: You must let the brownie cookies cool completely before filling them. If they are even slightly warm, the buttercream will melt into a greasy mess. Patience is key here!

Delicious Variations to Try

While this recipe is wonderful as is, it’s also a great base for a little experimentation. If you’re looking for other decadent bakes, you might also enjoy my Chocolate Peanut Butter Banana Bread.

• Salted Caramel Centre: Add a teaspoon of thick salted caramel sauce in the middle of the buttercream before sandwiching the cookies together for an extra layer of gooey deliciousness.
• Peanut Butter Cookie Dough: Replace 50g of the butter in the buttercream with smooth peanut butter for a nutty, salty twist that pairs brilliantly with the dark chocolate cookies.
• Espresso Kick: Dissolve 1 teaspoon of instant espresso powder in the vanilla extract for the brownie cookies to intensify the chocolate flavour.

What to Serve With Brownie Cookie Sandwiches

These are a full-blown dessert in their own right, but a simple accompaniment can round them out beautifully.

• Cold Milk: The classic pairing for any cookie. A tall glass of cold milk is the perfect companion to cut through the richness.
• Vanilla Bean Ice Cream: For a truly over-the-top dessert, serve a cookie sandwich alongside a small scoop of high-quality vanilla bean ice cream.
• Strong Coffee: An espresso or a strong Americano works wonderfully. The bitterness of the coffee provides a lovely contrast to the sweetness of the sandwiches.

Frequently Asked Questions

Brownie Cookie Sandwiches With Cookie Dough Buttercream

Rich, fudgy brownie cookies sandwich a creamy, edible chocolate chip cookie dough buttercream for the ultimate decadent dessert.

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Prep Time 30 minutes mins

Cook Time 20 minutes mins

Total Time 1 hour hr 30 minutes mins

Servings: 12 sandwiches

Course: Dessert

Cuisine: American

Calories: 415

Ingredients Method Notes

Ingredients

  

For the Brownie Cookies

• 125 g unsalted butter cubed
• 150 g dark chocolate 70% cocoa solids, roughly chopped
• 2 large free-range eggs at room temperature
• 175 g light brown soft sugar
• 1 tsp vanilla extract
• 75 g plain flour
• 25 g cocoa powder
• 1/4 tsp bicarbonate of soda
• Pinch of salt

For the Cookie Dough Buttercream

• 60 g plain flour
• 125 g unsalted butter softened
• 100 g light brown soft sugar
• 50 g icing sugar sifted
• 2 tbsp milk
• 75 g miniature milk chocolate chips

Method

 

1. Preheat your oven to 180°C (160°C fan) and line two large baking trays with parchment paper.
2. First, make the brownie cookies. Place the cubed butter and chopped dark chocolate in a heatproof bowl set over a small saucepan of simmering water (a bain-marie). Stir occasionally until completely melted and smooth. Set aside to cool for 5-10 minutes.
3. In a separate large bowl, using an electric hand mixer or a stand mixer with the whisk attachment, beat the eggs and light brown sugar together for 3-4 minutes until pale, thick, and voluminous. Whisk in the vanilla extract.
4. Gently pour the cooled chocolate mixture into the egg mixture and fold it through with a spatula until just combined. Be careful not to knock out too much air.
5. Sift the plain flour, cocoa powder, bicarbonate of soda, and a pinch of salt over the wet ingredients. Fold everything together until no floury streaks remain. The batter will be thick and glossy.
6. Drop heaping tablespoons of the batter onto your prepared baking trays, leaving at least 5cm of space between each one to allow for spreading. I find that using a medium ice cream scoop gives you perfectly uniform cookies, which is ideal for sandwiches. You should get about 24 cookies.
7. Bake for 10-12 minutes. The edges should be set and the tops will be cracked and shiny, but the centre should still be slightly soft. They will firm up as they cool. Leave them on the tray for 5 minutes before transferring them to a wire rack to cool completely.
8. While the cookies are cooling, make the buttercream. First, heat-treat the flour to kill any bacteria. Spread the flour on a baking tray and bake at 180°C (160°C fan) for 5 minutes, or microwave on high for 60-90 seconds until it reaches 74°C. Let it cool completely.
9. In a large bowl, beat the softened butter with an electric mixer until light and creamy. Add the light brown sugar and icing sugar and beat again for 3-5 minutes until very pale and fluffy.
10. Add the cooled flour, vanilla, milk, and salt, and beat on a low speed to combine, then increase the speed and beat for another 2 minutes until smooth. Fold in the miniature chocolate chips.
11. To assemble, pair up the cooled brownie cookies by size. Pipe or spoon a generous amount of the cookie dough buttercream onto the flat side of one cookie, then gently press another cookie on top to create your sandwich. Repeat with the remaining cookies.

Notes

Store the sandwiches in an airtight container at room temperature for up to 3 days, or in the refrigerator for up to a week.

I really hope you give this brownie cookie sandwich recipe a try. They are such a fun and rewarding bake, and the result is a truly impressive dessert that always gets rave reviews. If you enjoy this, you should also check out my classic Banana Bread Recipe for another comforting bake. Let me know how you get on in the comments below – I’d love to hear about it!