Brownie Mix Double Fudge Bars

Name: Brownie Mix Double Fudge Bars
Prep time: 15 min
Cook time: 25 min
Total time: 40 min
Yield: 12 bars
Ingredients: 1 box brownie mix; 2 large eggs; 1/2 cup vegetable oil; 1/4 cup water; 1/2 cup chocolate chips; 2 tablespoons cocoa powder (optional); 1/2 cup nuts or other mix-ins (optional)

Highlighted under: Sweet Indulgence

I absolutely love making Brownie Mix Double Fudge Bars because they are incredibly easy and so delicious. With just a few ingredients, I can whip up a batch of these fudgy treats that are perfect for sharing or indulging in myself. The best part? I can customize them with my favorite toppings, like nuts or chocolate chips, to elevate their flavor. Whether I’m enjoying them fresh out of the oven or letting them cool completely, these bars always satisfy my sweet tooth cravings.

Created by

Bethany Clarke

Last updated on 2026-02-24T03:36:44.126Z

My journey with Brownie Mix Double Fudge Bars began when I wanted a quick dessert for a gathering. I was astonished at how simple it was to create such rich and fudgy bars from a brownie mix. The secret lies in adding a bit of extra cocoa powder and chocolate chips to the batter, which enhances the chocolate flavor and gives the bars a gooey, indulgent texture.

Over time, I've experimented with different mix-ins like walnuts and caramel swirls. Each variation brought something unique to the table! I find that the key to achieving the perfect chewy consistency is not to over-bake them. A little softness in the center is totally okay because they'll firm up as they cool.

Why You'll Love This Recipe

Decadent chocolate flavor that satisfies any sweet tooth
Easy preparation with minimal ingredients necessary
Endless customization options with mix-ins and toppings

The Art of Mixing

When combining the brownie mix, eggs, vegetable oil, and water, be careful not to overmix the batter. Mix until just combined; this will keep your brownies fudgy and dense rather than cakey. If you see streaks of dry mix, it’s perfectly fine—stirring too much can incorporate air, which changes the texture.

The addition of chocolate chips not only enhances the chocolate flavor but also provides added texture and richness in every bite. For an extra chocolate kick, consider melting a few chips and swirling them into the batter before pouring it into the pan.

Perfectly Baked Brownies

Baking the brownies at 350°F (175°C) is crucial for achieving the ideal fudgy consistency. Keep an eye on them during the last few minutes—check for a toothpick to come out with a few moist crumbs stuck to it, indicating that they are perfectly underbaked yet set. Overbaking leads to dry brownies, so remove them from the oven promptly.

If you're unsure about the timing, start checking at the 25-minute mark. Ovens can vary, and some may require a bit more time. Look for slightly firm edges and a soft center that will continue to set as they cool.

Ingredients

Gather these ingredients before you start:

Ingredients

1 box brownie mix
2 large eggs
1/2 cup vegetable oil
1/4 cup water
1/2 cup chocolate chips
2 tablespoons cocoa powder (optional)
1/2 cup nuts or other mix-ins (optional)

Make sure to measure accurately for the best results!

Instructions

Follow these steps to make your brownie bars:

Preheat the Oven

Preheat your oven to 350°F (175°C) and grease a 9x9-inch baking pan or line it with parchment paper.

Mix the Ingredients

In a large bowl, combine the brownie mix, eggs, vegetable oil, and water. Stir until just combined, and fold in the chocolate chips and cocoa powder if using.

Transfer to Pan

Pour the batter into the prepared baking pan, spreading it evenly.

Bake

Bake in the preheated oven for 25-30 minutes or until a toothpick inserted into the center comes out with a few moist crumbs.

Cool and Cut

Let the brownies cool in the pan for about 10 minutes, then transfer them to a wire rack to cool completely before cutting into squares.

Enjoy your homemade Brownie Mix Double Fudge Bars!

Pro Tips

Be careful not to overmix the batter
this helps keep the bars fudgy and soft.

Storage Tips

Once cooled, these brownies can be stored in an airtight container at room temperature for up to five days, maintaining their desirable chewy texture. If you want to keep them fresh longer, consider refrigerating them for up to a week, although they may lose some of their gooeyness.

For longer-term storage, brownie bars freeze beautifully. Wrap individual squares in plastic wrap and then place them in a freezer-safe bag. They can last up to three months in the freezer. When you’re ready to enjoy, simply let them thaw in the refrigerator or at room temperature.

Customization Ideas

Feel free to get creative with your mix-ins. Chopped nuts, like walnuts or pecans, add a wonderful crunch, while a sprinkle of sea salt can elevate the chocolate flavor even further. For something unique, try adding a swirl of peanut butter or caramel once the batter is in the pan for an indulgent twist.

If you're looking for a richer flavor, increasing the cocoa powder to 4 tablespoons instead of 2 will create a more intense chocolate profile. Just be sure to balance this with a bit more moisture—maybe an extra tablespoon of oil or water—to maintain the right texture.

Questions About Recipes

→ Can I use a different type of brownie mix?

Absolutely! Any brand or type of brownie mix will work, just follow the instructions on the package for best results.

→ How should I store the leftover bars?

Store them in an airtight container at room temperature for up to 3 days, or refrigerate them for longer freshness.

→ Can I freeze these brownies?

Yes, you can freeze these brownies! Wrap them tightly in plastic wrap and place them in a freezer-safe container for up to 2 months.

→ What can I use instead of eggs?

You can substitute eggs with applesauce or a flaxseed mixture for a vegan option. Use 1/4 cup of applesauce or 1 tablespoon of ground flaxseed mixed with 3 tablespoons of water per egg.