Brownie Mix Chocolate Chip Cookie Bars

Name: Brownie Mix Chocolate Chip Cookie Bars
Prep time: 15 min
Cook time: 25 min
Total time: 40 min
Yield: 16 bars
Ingredients: 1 box brownie mix; 1/2 cup butter, melted; 1 large egg; 1 cup chocolate chips; 1/2 cup all-purpose flour

Highlighted under: Whisk & Bake

I love making these Brownie Mix Chocolate Chip Cookie Bars when I crave something sweet yet easy to prepare. The combination of rich brownie flavor with gooey chocolate chips creates a delightful treat that everyone enjoys. With minimal ingredients and less time spent in the kitchen, these bars come together quickly. The hardest part is waiting for them to cool before diving in! I like to add a sprinkle of sea salt on top for a touch of sophistication and balance.

Created by

Perrie Lawson

Last updated on 2026-02-23T23:49:37.156Z

When I first experimented with these Brownie Mix Chocolate Chip Cookie Bars, I found that using a box mix for brownies saved a lot of time while still delivering that rich flavor we all love. It’s a foolproof way to whip up a special dessert without the fuss of traditional baking. I added chocolate chips that melt beautifully and create pockets of gooey goodness in every bite.

Throughout my baking experience, I’ve learned the importance of cooling these bars completely before cutting them. It allows the texture to solidify and makes for cleaner, neater slices. Don’t forget to add a pinch of sea salt on top; it enhances the chocolate flavor remarkably!

Why You Will Love These Bars
Decadent combination of brownie and cookie textures
Easy and quick to make with minimal ingredients
Gooey chocolate chips that melt in your mouth

Understanding the Ingredients

The beauty of these Brownie Mix Chocolate Chip Cookie Bars lies in their simplicity. Each ingredient plays a crucial role in achieving the perfect texture and flavor. The brownie mix forms the rich base, providing that decadent chocolate flavor, while the melted butter ensures a fudgy consistency. The egg helps bind all the ingredients together, creating a moist texture that contrasts beautifully with the gooey chocolate chips. Without these key components, the bars could end up dry or overly crumbly, so it's important to stick to the recipe unless you have a specific substitute in mind.

When it comes to chocolate chips, you can get creative if needed. Semi-sweet chips are traditional for that classic brownie cookie combo, but feel free to swap in dark chocolate for a richer taste, or even white chocolate for a sweeter profile. If you're looking for an extra crunch, try adding chopped nuts or toffee bits to the mix. Just keep in mind that depending on what you add, it may slightly alter baking times, so be vigilant while baking!

Baking Tips for Success

Baking these bars to perfection requires a keen eye. When you pour the batter into the prepared pan, spread it evenly to ensure uniform baking. Watch for the right moment to take them out of the oven. The edges should be set and slightly pulling away from the sides, while the center might have a little jiggle. A toothpick inserted should come out with a few moist crumbs, which indicates a fudgy texture rather than underbaking. If you lean towards cake-like bars, leaving them in for an additional few minutes can help achieve that consistency.

Cooling is a critical step that can't be rushed. Allowing the bars to cool for at least 20 minutes ensures they're not only easier to slice but also helps set the fudgy texture that makes them so delightful. Cutting them too early can lead to a messy, crumbly result. For perfectly sized squares, I recommend using a sharp, non-serrated knife and wiping it clean between cuts to maintain clean edges. This way, you'll have beautiful, presentable squares to share with friends and family!

Ingredients

Gather these simple ingredients to make your cookie bar masterpiece:

Ingredients

1 box brownie mix
1/2 cup butter, melted
1 large egg
1 cup chocolate chips
1/2 cup all-purpose flour

Now that you have your ingredients ready, mix them together to create the batter!

Instructions

Follow these steps to bake your Brownie Mix Chocolate Chip Cookie Bars:

Preheat the Oven

Preheat your oven to 350°F (175°C) and grease a 9x9 inch baking pan.

Mix Ingredients

In a large bowl, combine the brownie mix, melted butter, and egg. Stir until just mixed, then fold in the flour and chocolate chips.

Bake the Bars

Pour the batter into the prepared baking pan and spread it evenly. Bake for 25 minutes or until a toothpick inserted in the center comes out with a few moist crumbs.

Cool and Slice

Allow the bars to cool in the pan for at least 20 minutes before slicing into squares.

Enjoy your delicious bars with a glass of milk or share them at your next gathering!

Pro Tips

For an extra kick, add nuts or a swirl of peanut butter in the batter before baking.

Storing and Freezing

If you're lucky enough to have leftovers, storing these bars is easy! Keep them in an airtight container at room temperature for up to three days. If you want to enjoy them longer, consider freezing them. Wrap individual squares tightly in plastic wrap, then place them in a freezer-safe bag. They can be frozen for up to three months. Just make sure to let them thaw in the refrigerator or at room temperature before indulging, ensuring they retain their rich, gooey texture.

For even greater convenience, you can also store the batter in the fridge for up to 24 hours before baking. Just keep it covered, and when you’re ready, pour it into the prepared pan and bake as directed. This can be particularly useful for spontaneous gatherings or those days when you simply don’t have the time to prep from scratch.

Variation Ideas

While the classic Brownie Mix Chocolate Chip Cookie Bars are undeniably delicious, there’s room for creativity! Consider adding a swirl of peanut butter or Nutella to the batter before baking for an extra layer of flavor. Just drop spoonfuls of your chosen spread onto the batter and use a knife to gently swirl it in, creating a marbled effect that not only looks stunning but adds delightful flavor variations in every bite.

You can also switch up the toppings before baking. Adding crushed Oreos, M&Ms, or even shredded coconut can change the whole personality of the bar without altering the core recipe. If you're feeling nostalgic, try incorporating butterscotch chips for a unique twist that feels reminiscent of classic dessert bars. The beauty of this recipe is its versatility – have fun experimenting to find your perfect version!

Questions About Recipes

→ Can I use a different type of chocolate mix?

Yes, you can substitute the brownie mix with any type of chocolate mix you prefer, but that's what makes these bars uniquely delicious!

→ How should I store these bars?

Store them in an airtight container at room temperature for up to a week.

→ Can I freeze the cookie bars?

Absolutely! Wrap the bars tightly in plastic wrap and place them in a freezer-safe container. They can be frozen for up to 3 months.

→ What can I use instead of eggs?

You can use a flaxseed egg or unsweetened applesauce as a substitute for eggs in this recipe.