The Best Brookie Bars With Brownie Mix 

Brookie BarsWith Brownie Mix  – Combination of a fudgy brownie layer and a homemade brown butter chocolate chip cookie layer, delivering the best of both worlds in an irresistible treat.

If you can’t decide between fudgy brownies and chewy chocolate chip cookies, why not have both? This Brookie Bars recipe is the best of both worlds—part brownie, part cookie, and completely delicious. Plus, using a boxed brownie mix keeps things simple, so you can get straight to the good part: eating them.

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Why you should make these Brookie Bars?

• Best served warm – Add a scoop of vanilla ice cream and thank me later.
• Easy to make – A boxed brownie mix takes out the guesswork, but they still taste homemade.
• Perfect texture – Soft, chewy, and just the right amount of fudgy.
• Crowd favorite – These always disappear fast, so maybe make a double batch.
• Homemade Charm: The homemade brown butter chocolate chip cookie layer adds a touch of authenticity, making the brookies feel like a labor of love and impressing your friends and family with your baking skills.

What ingredients you will need!

• Box of brownie mix: I used my favorite brand Ghirardelli! (plus ingredients needed for that)
• Unsalted butter – I love to use unsalted but you can use whatver you have on hand!
• Brown sugar – I have recently switched from light to dark, but again, you can use whatever you want! 
• Large egg (room temperature)
• Egg yolk (room temperature)
• Pure vanilla extract – this one is my favorite brand
• Cornstarch – make sure it is fresh! this makes the cookie dough stay soft for days! 
• Purpose flour – Remember to scoop and level your flour!
• Mini semi-sweet chocolate chips – I prefer this over regular, but again use whatver you have on hand! 

Step by step Brookie Bars

• 1. Prep the Baking Pan
• Heat oven to 325°F. Line a 9×9-inch pan with parchment paper and lightly coat with non-stick spray

2. Make the Brownie Batter

• Prepare the boxed brownie mix according to the package instructions (usually combining cocoa powder, eggs, oil, and water). Set aside.

3. Make the Cookie Dough Layer

• Melt unsalted butter in a small saucepan over medium heat until golden brown. Let cool for 10-15 minutes.
• In a medium bowl, whisk together the flour, cornstarch, baking powder, and salt.
• In a large mixing bowl, mix the brown sugar, melted butter, and white sugar with a hand mixer until combined.
• Add the egg and egg yolk, whisking well after each addition.
• Stir in vanilla extract.
• Using a rubber spatula, fold in the dry ingredients, then gently mix in the chocolate chips.

4. Assemble the Brookies

• Drop spoonfuls of cookie dough over the prepared brownie batter, alternating between the two for that signature brookie look.
• Use an offset spatula to gently spread the layers, making sure you get both cookie and brownie in every bite.
• 5. Bake the Brookies
• Bake for 50-55 minutes or until a toothpick inserted into the center comes out with moist crumbs.
• Let cool completely on a wire rack before slicing into small squares (or big ones—no judgment here).

Expert Baking Tips – Brookie Bars

Additionally, here are some baking tips to keep in mind when making these brookie bars:

• For extra gooey brookies, slightly underbake them and let them set in the pan.
• Storage – Keep in an airtight container at room temperature for up to 4 days.
• To freeze – Wrap individual pieces in plastic wrap, then store in a freezer bag.
• Warm them up – A quick zap in the microwave makes them taste freshly baked.
• For the best brookie texture, when assembling, alternate between the brownie batter and cookie dough in small scoops—the smaller, the better! This helps create that beautiful marbled look and ensures every bite has a perfect balance of both layers.
• Brown your butter – This extra step adds a nutty, rich depth of flavor to the cookie dough. Just be sure to let it cool slightly before mixing with the sugar
• Use room temperature eggs – This helps the cookie dough mix smoothly and creates a better texture in the final bake.
• Don’t overmix the cookie dough – Overmixing can lead to dense cookies instead of soft and chewy ones.
• Check for doneness with a toothpick – Insert a toothpick into the center. If it comes out with moist crumbs but no raw batter, your brookies are done.
• Let them cool before slicing – I know it’s hard to wait, but letting the brookies cool completely helps them set up for clean slices.
• For crispier edges and a gooey center, bake in a metal pan rather than a glass dish.
• For extra gooey brookies, slightly underbake them and let them set in the pan.

Frequently asked question 

Q: Can I use a different type of brownie mix or cookie dough recipe?

A: Yes, you can experiment with different brands or flavors of boxed brownie mix, or even try making your own homemade brownie batter from scratch.

Q: Can I use salted butter instead of unsalted butter?

A: While the recipe generally calls for unsalted butter, you can use salted butter if that’s what you have on hand. Just be mindful that the overall saltiness may be slightly different, so you might want to adjust the added salt accordingly.

Q: How do I know when the brookies are done baking?

A: The baking time can vary depending on the specific brownie mix and oven temperature. To check for doneness, insert a toothpick into the center of the brookies. If it comes out with moist crumbs or a few moist chocolate streaks, they are likely done. Remember that they will continue to set as they cool, so you don’t want to overbake them.

Essential equipment for your kitchen 

Furthermost, here are five essential kitchen equipment items for baking:

• Stand Mixer: A stand mixer is a game-changer in the baking world, making mixing doughs, batters, and frostings a breeze.
• Mixing Bowls: A set of high-quality mixing bowls in various sizes is indispensable for baking. They are sturdy, easy to clean, and non-reactive.
• Baking Pans: Stock your kitchen with a range of baking pans and sheets, including cake pans, muffin pans, and cookie sheets.
• Cooling racks allow air to circulate around baked goods, preventing them from becoming soggy.
• Silicone Spatulas: Silicone spatulas are versatile tools for scraping batter, folding ingredients, and ensuring you get every last bit of goodness from your mixing bowl.

Storing and freezing –  Brookie Bars

Additionally, here is how to store your Brookie bars! To properly store, allow them to cool completely, then transfer them to an airtight container or wrap them tightly in plastic wrap. Store at room temperature for a few days, in the refrigerator for up to a week, or in the freezer for a few months. Bring them to room temperature before serving.

Freezing

To properly freeze brookies, ensure they have cooled completely. Place them in an airtight container or wrap them tightly in plastic wrap, making sure to remove as much air as possible. Label the container with the date and freeze for up to a few months. Thaw the brookies in the refrigerator or at room temperature before serving.

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If you loved these Brookie Bars don’t forget to leave a 5-star rating and a comment! I’d love to hear your feedback or answer any questions you have! Follow me on Instagram, Pinterest, and TikTok. I post so many fun things on all platforms.

Recipe

Brookie Bars

Molly Murphy

Combination of a fudgy brownie layer and a homemade brown butter chocolate chip cookie layer, delivering the best of both worlds in an irresistible treat.

5 from 18 votes

Print Recipe Pin Recipe

Course Dessert

Cuisine bars

Servings 16

Ingredients

 

US CustomaryMetric

 

1x2x3x

For the brookies

• 1 Ghirardelli dark chocolate boxed brownie or your favorite brand
• ¾ cup unsalted butter
• ¾ cups packed brown sugar
• 1 large egg room temperature
• 1 egg yolk room temperature
• 1 Tablespoon pure vanilla extract
• 1 teaspoon cornstarch
• ¾ teaspoon baking powder
• 1 teaspoon salt
• 1 ½ cups all-purpose flour
• ½ cup mini semi sweet chocolate chips

Instructions

 

For the bars

• Preheat your oven to 325 degrees F. Line a 9×9 with parchment paper, spray with cooking spray. Set aside.
• Prepare the boxed brownie mix according to the package instructions. This usually involves combining the mix with eggs, oil, and water. Mix until well combined and set aside.
• In a small saucepan, melt the unsalted butter over medium heat. Continue cooking the butter until it turns a light golden brown color, stirring occasionally. This takes about 3-4 minutes. Be careful not to burn it. Remove from heat and let it slightly cool for 10-15 minutes.
• In a medium sized bowl, sift together the cornstarch, baking powder, salt, and flour.
• In a medium size mixing bowl, combined the brown butter and the brown sugar and using a whisk, whisk together until combined. About 30 seconds.
• Next, whisk in each egg and egg yolk, one at time. Mix vigorously after each addition. This helps create that nice shine on top of the cookie. Add in the vanilla.
• With a rubber spatula, fold the dry ingredients into the wet ingredients, add the chocolate chips, and mix until no streaks of flour remain. Do not over mix.
• Using two spoons, alternate between the brownie batter and cookie dough by dropping small balls or dollops (the smaller the better this helps create that beautiful brookie look) into the prepped pan until you used both the cookie dough and the brownie batter. Try to evenly distribute the two throughout.
• Bake in the for 50-55 minutes depending on your oven, or until a toothpick inserted into the center comes out with moist crumbs.
• Remove from the oven and let the brookies cool in the pan until you are ready to serve.
• Serve and enjoy the deliciousness of your homemade brookies!

Keyword brookie, bars, brown butter

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