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 (family size); 1/2 cup unsalted butter, melted; 2 large eggs; 1 cup chocolate chips; 1/2 cup all-purpose flour

Highlighted under: Cakes, Pies & More

I love whipping up a batch of these Brownie Mix Chocolate Chip Cookie Bars when I need a quick and delicious treat. Using brownie mix as the base makes the process so much easier and guarantees a rich, fudgy texture. The addition of chocolate chips takes these bars to the next level, combining the best of both cookies and brownies in one gooey bite. Perfect for family gatherings or movie nights, these bars are sure to be a hit every time.

Created by

Paige Sullivan

Last updated on 2026-02-24T04:13:36.361Z

When I first made these Brownie Mix Chocolate Chip Cookie Bars, I was amazed at how simple it was to turn a box of brownie mix into a decadent dessert that feels homemade. I love the way the chocolate chips melt into the bars, adding extra richness and texture. This recipe is great because it combines both brownies and cookies, making it the perfect treat for any occasion.

One specific tip that really helped me achieve the best results was not to overmix the batter. Overmixing can lead to a denser texture, which is not what we want here. By mixing just until combined, I ensure that each bite is soft and chewy, and bursting with flavor!

        Why You Will Love This Recipe
        Rich chocolate flavor from the brownie mix
Choc-full of melty chocolate chips
A delightful combination of cookie and brownie textures
Easy to make and perfect for sharing

      

Understanding Brownie Mix

Using brownie mix as the base for these cookie bars streamlines the baking process without sacrificing flavor. The pre-mixed ingredients not only save time but also ensure a consistent, fudgy texture that is hard to achieve from scratch. Make sure to select a high-quality brownie mix for the best results, as this will significantly impact the overall flavor and mouthfeel.

The melted butter plays a crucial role by adding richness and contributing to the moist texture of the bars. When incorporating the brownie mix and butter, ensure that the butter is not too hot, which can cook the eggs prematurely. Instead, let it cool slightly until it’s warm to the touch before mixing it in.

Perfecting The Bake

Baking at the right temperature, 350°F (175°C), is essential for achieving that perfect balance between chewy and fudgy. If your oven tends to run hot, consider using an oven thermometer to ensure accuracy. The bars should bake for about 25 minutes, but keep an eye on them; the edges will start to pull away from the pan and become lightly golden, while the center remains soft.

For best results, test doneness using a toothpick. When inserted, it should come out with a few moist crumbs, indicating that the bars are cooked but still gooey in the middle. Baking too long will result in dry bars, so if you see excessive crumbs on the toothpick, they may need a couple more minutes, but check frequently.

Ingredients

For the Bars

1 box brownie mix (family size)
1/2 cup unsalted butter, melted
2 large eggs
1 cup chocolate chips
1/2 cup all-purpose flour

Make sure all ingredients are at room temperature for the best results!

Instructions

Preheat the Oven

Preheat your oven to 350°F (175°C) and grease a 9x13 inch baking pan or line it with parchment paper.

Mix Ingredients

In a large mixing bowl, combine the brownie mix, melted butter, and eggs. Stir until just combined, then fold in the chocolate chips and flour gently.

Bake

Pour the batter into the prepared baking pan and spread evenly. Bake for 25 minutes or until a toothpick inserted in the center comes out mostly clean.

Cool and Cut

Allow the bars to cool in the pan for about 10 minutes before transferring to a wire rack to cool completely. Once cooled, cut into squares and enjoy!

Enjoy warm or at room temperature. These bars can be stored in an airtight container for up to a week.

Pro Tips

For an extra touch, sprinkle sea salt on top before baking to enhance the chocolate flavor!

Storing and Serving

These brownie mix chocolate chip cookie bars can be stored in an airtight container at room temperature for up to five days. If you prefer, you can refrigerate them to extend their shelf life by a few additional days. Be sure to separate layers with parchment paper to prevent sticking.

For serving, I find they are best enjoyed at room temperature, allowing the chocolate chips to soften slightly. These bars can also be warmed in the microwave for about 10-15 seconds, making them an indulgent treat reminiscent of freshly baked cookies.

Customization Ideas

Feel free to customize your bars with different mix-ins. Nuts like walnuts or pecans can add a delightful crunch, while additional spices like a dash of cinnamon can enhance the flavor profile. For a festive touch, try incorporating seasonal treats like peppermint or orange zest during the holidays.

If you want a less sweet option, consider reducing the chocolate chips to 3/4 cup. You could also substitute half the chocolate chips with dried fruit or shredded coconut for a unique twist. Just remember that changing the ingredients can alter the texture slightly, so tweak them according to your preference.

Questions About Recipes

→ Can I use cookie mix instead of brownie mix?

While you can, the unique fudgy texture of brownies enhances the flavor and makes for a richer bar.

→ How do I know when the bars are done baking?

The edges should look set, and a toothpick inserted should come out with a few moist crumbs.

→ Can I add nuts to the recipe?

Absolutely! Chopped nuts can be added along with the chocolate chips for extra texture.

→ How should I store the cookie bars?

Store them in an airtight container at room temperature for up to a week or in the fridge for longer freshness.