Fudgy 3-Ingredient Cake Mix Brownies
Cake mix brownies are the shortcut you keep in your back pocket for busy weeknights, last-minute potlucks, or any time you need a chocolate fix without measuring flour and cocoa.
With just a box of chocolate cake mix, two eggs, and oil, you get a pan of dense, chewy brownies in under half an hour.
Why These Cake Mix Brownies Work
The edges sneak in a little chew while the centers stay soft and dense, all without pulling out a bag of flour or a sifter.
A standard cake mix already has the cocoa, sugar, and leavening built in, so you are just adding fat and eggs to turn a cake batter into something that bakes up like a true brownie.
They hold together for a fudgy sandwich but do not taste like cake. They land squarely in brownie territory.
Ingredients
- 1 box (15.25 oz) chocolate cake mix: any standard mix works, though devil’s food makes them even deeper.
- 2 large eggs
- 1/2 cup vegetable oil: or melted butter for a slightly richer flavor.
Variations / Substitutions
- Swap the oil: melted butter adds a subtle buttery note; melted coconut oil gives a faint tropical hint.
- Add-ins while mixing: fold in 1/2 cup chocolate chips, chopped walnuts, or toffee bits before spreading the batter in the pan.
- Double the batch in a larger pan: spread the same batter in a 9×13 pan for thinner brownies, and start checking a few minutes early.
Self-Saucing Caramel Pudding Cake is another reader favorite dessert worth making next.
How To Make Cake Mix Brownies
Step 1: Mix the Batter
Preheat your oven to 350°F (175°C). In a large bowl, stir together the 1 box chocolate cake mix and the 2 large eggs until the dry mix disappears. Pour in the 1/2 cup oil and keep stirring until you have a thick, glossy batter with no streaks.
Step 2: Bake the Brownies
Line an 8×8 inch baking pan with parchment paper or grease it well. Scrape the batter into the pan and spread it into an even layer. Bake for 18 to 22 minutes, until a toothpick inserted in the center comes out with a few moist crumbs. The edges will look set while the center still looks a little underdone.
Step 3: Slice and Serve
Let the pan cool on a wire rack until the brownies are completely firm, at least an hour. Lift the whole slab out using the parchment, then slice into 9 squares with a sharp knife. Wipe the blade between cuts for clean edges and enjoy warm or at room temperature.
Tips for the Best Brownies
- A metal pan gives you the crispest corners; glass pans take longer and make softer edges.
- Stir just until the batter comes together once you add the oil. Overmixing can make the brownies tough.
- For a shinier top, use melted butter instead of oil and pour it in while it is still a little warm.
- Check at 18 minutes even if your timer says otherwise. The toothpick test is more reliable than the clock because oven temps vary.
Bake times change with the pan you grab.
| Pan Size | Bake Time |
|---|---|
| 8×8 inch | 18 to 22 minutes |
| 9×9 inch | 15 to 18 minutes |
| 9×13 inch | 15 to 18 minutes |
Storing Leftover Brownies
- Refrigerate: keep in an airtight container at room temperature for up to 4 days, or in the fridge for a week.
- Reheating: a quick 15-second zap in the microwave brings back that just-baked softness.
- Serve Cold: they are fine straight from the fridge, but room temperature shows off the fudge texture best.
What To Serve With Brownies
A scoop of vanilla ice cream melting over a warm square plays up the chewiness and the deep chocolate. A cold glass of milk is the classic match, cutting through the richness. For a little color on a plate, dust them with powdered sugar or cocoa right before serving.
Frequently Asked Questions
Can I use a different cake mix flavor?
Yes. Devil’s food, dark chocolate, and even red velvet mixes all work and give a slightly different character.
Do I need to add water or milk?
No. The eggs and oil provide all the moisture needed. Adding liquid will thin the batter and change the texture.
My brownies came out dry. What happened?
They likely overbaked. Pull them when the toothpick shows a few moist crumbs, not a completely clean pick.
Can I make these gluten-free?
Yes. Use a gluten-free chocolate cake mix of the same weight. Everything else stays the same.
Cake Mix Brownies Recipe
Ingredients
Method
- Preheat oven to 350°F (175°C). Grease or line an 8×8 inch baking pan.
- Stir cake mix and eggs together in a bowl until dry mix is absorbed. Add the oil and stir until a thick, glossy batter forms.
- Spread the batter evenly in the prepared pan. Bake 18 to 22 minutes, until a toothpick inserted in the center comes out with a few moist crumbs.
- Cool completely in the pan, then lift out the slab and slice into 9 squares.
Notes
