If you ask me, cornflake brownie bars are pure comfort food genius.
These chewy chocolate bars combine the rich fudginess of brownies with the satisfying crunch of cornflakes on top. The sweet chocolate base pairs with the cereal’s golden crispiness for a texture combination that hits just right.
They’re made with simple pantry ingredients and come together in one bowl. The cornflakes get mixed right into the batter, then more get sprinkled on top for extra crunch.
It’s an easy dessert that feeds a crowd, perfect for potlucks or when you need something sweet that’s different from regular brownies.
Why You’ll Love These Cornflake Brownie Bars
- Perfect texture combination – The fudgy brownie base paired with the crunchy cornflake topping creates an irresistible contrast that makes every bite interesting.
- Show-stopping dessert – These bars look impressive and taste even better, making them perfect for potlucks, bake sales, or when you want to wow your friends and family.
- Easy to share – Cut into neat squares, these brownies are perfect for serving a crowd and much easier to portion than regular brownies.
- Sweet and salty balance – The rich chocolate brownie gets a lovely contrast from the salted caramel cornflake layer, hitting all the right flavor notes.
- Make-ahead friendly – These bars actually taste better the next day once everything has set properly, so you can prepare them in advance for parties or busy weekdays.
What Kind of Chocolate Should I Use?
For these cornflake brownie bars, you’ll want to use a good quality dark chocolate since it’s one of the main flavors in your brownies. I’d recommend going with something in the 60-70% cocoa range – this gives you that rich chocolate taste without being too bitter or overpowering the other flavors. You can use chocolate bars, baking chocolate, or even high-quality chocolate chips, just make sure to chop bars into smaller pieces so they melt evenly with the butter. If you only have milk chocolate on hand, that’ll work too, though your brownies will be a bit sweeter and less intense in chocolate flavor.
Options for Substitutions
This recipe is pretty adaptable, so here are some swaps you can make if needed:
- Dark chocolate: You can use milk chocolate or semi-sweet chocolate chips instead, but your brownies will be a bit sweeter. If using milk chocolate, reduce the granulated sugar by about 30g.
- Brown sugar: White granulated sugar works fine here, though you’ll lose some of that rich molasses flavor. You could also try coconut sugar for a slightly different taste.
- Double cream: Heavy cream or whipping cream work just as well. In a pinch, you can use whole milk, but heat it gently and add an extra tablespoon of butter to the caramel.
- Cornflakes: This is where you can get creative! Try rice krispies, crushed digestive biscuits, or even toasted oats. Just keep the same amount and make sure whatever you use has some crunch.
- Plain flour: All-purpose flour is the same thing, so you’re good there. You could try using half plain flour and half almond flour for a nuttier flavor.
- Cocoa powder: Make sure you’re using unsweetened cocoa powder. Dutch-processed works too, but regular cocoa powder gives a more intense chocolate flavor.
Watch Out for These Mistakes While Baking
The biggest mistake when making cornflake brownie bars is adding the cornflakes to hot caramel, which will make them soggy and lose their signature crunch – always let your caramel cool for about 10 minutes before folding in the cereal.
Another common error is overbaking the brownie base, so pull it out when a toothpick inserted in the center still has a few moist crumbs attached rather than coming out completely clean.
Don’t rush the caramel-making process by cranking up the heat, as this can cause the sugar to burn and turn bitter – medium heat and patience are your best friends here.
Finally, resist the urge to cut into these bars right away; letting them cool completely (at least 2 hours) will give you clean slices instead of a gooey mess.
What to Serve With Cornflake Brownie Bars?
These rich, crunchy brownie bars are pretty amazing on their own, but they pair beautifully with a cold glass of milk or a hot cup of coffee. The sweet, fudgy chocolate base with that crispy cornflake topping makes them perfect for serving at parties or potluck dinners alongside some fresh berries or vanilla ice cream. If you want to get fancy, try serving them with a dollop of whipped cream or even a drizzle of caramel sauce. They’re also great packed up as gifts or enjoyed as an afternoon treat with a warm mug of hot chocolate.
Storage Instructions
Keep Fresh: These cornflake brownie bars are best stored in an airtight container at room temperature for up to 5 days. The cornflakes will stay nice and crunchy, and the brownie base keeps its fudgy texture. I like to cut them into squares first, then layer them with parchment paper between each layer.
Freeze: You can definitely freeze these bars for longer storage! Wrap individual pieces in plastic wrap or store them in a freezer-safe container for up to 3 months. They’re actually pretty good eaten straight from the freezer if you like a firmer texture, or just let them thaw for about 30 minutes.
Make Ahead: These bars are perfect for making ahead since they actually taste better after sitting for a day or two. The flavors meld together nicely, and the texture settles into the perfect balance of chewy brownie and crunchy cornflakes. Just make sure to let them cool completely before cutting and storing.
| Preparation Time | 20-30 minutes |
| Cooking Time | 35-40 minutes |
| Total Time | 130-150 minutes |
| Level of Difficulty | Medium |
Estimated Nutrition
Estimated nutrition for the whole recipe (without optional ingredients):
- Calories: 7300-7800
- Protein: 55-65 g
- Fat: 410-440 g
- Carbohydrates: 950-1050 g
Ingredients
For the brownie base:
- 8 oz unsalted butter
- 5 oz dark chocolate
- 5 large eggs
- 3/4 cup packed brown sugar (180g)
- 3/4 cup granulated sugar (180g)
- 3.5 oz all-purpose flour
- 1.75 oz unsweetened cocoa powder
- 1/4 tsp salt
For the cornflake caramel layer:
- 2 1/2 cups granulated sugar (480g)
- 5.25 oz unsalted butter, room temperature (150g)
- 1 1/4 cups warmed heavy cream (300ml)
- 1 tsp salt, or to taste
- 7.75 oz cornflakes (220g)
Step 1: Prepare the Oven and Pan
Preheat your oven to 180°C (350°F).
Grease and line a 9×12 inch cake tin with parchment paper to ensure your brownies come out easily after baking.
Step 2: Melt Butter and Chocolate
- 8 oz unsalted butter
- 5 oz dark chocolate
In a pot over medium heat, combine the unsalted butter and dark chocolate.
Stir gently until both have melted and the mixture is smooth.
Alternatively, you can melt them together in the microwave in short bursts, stirring between each.
Set aside and allow to cool.
Step 3: Make the Brownie Batter
- 5 large eggs
- 3/4 cup packed brown sugar (180g)
- 3/4 cup granulated sugar (180g)
- melted butter and chocolate from Step 2
- 3.5 oz all-purpose flour
- 1.75 oz unsweetened cocoa powder
- 1/4 tsp salt
In a large bowl, add the eggs, packed brown sugar, and granulated sugar.
Whip the mixture with an electric mixer or a whisk until it lightens in color and nearly doubles in volume.
Carefully pour in the cooled melted butter and chocolate from Step 2, whisking to combine.
Sift in the all-purpose flour, unsweetened cocoa powder, and salt.
Whisk gently until a smooth batter forms, taking care not to overmix.
Step 4: Bake the Brownies
- brownie batter from Step 3
Pour the brownie batter from Step 3 into your prepared cake tin.
Smooth the top evenly.
Bake in your preheated oven for 35–40 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.
Once done, remove from the oven and allow to cool for about 10 minutes.
Step 5: Make the Salted Caramel Cornflake Layer
- 2 1/2 cups granulated sugar (480g)
- 5.25 oz unsalted butter, room temperature (150g)
- 1 1/4 cups warmed heavy cream (300ml)
- 1 tsp salt, or to taste
- 7.75 oz cornflakes (220g)
In a non-stick pot with high sides, add about a quarter of the granulated sugar and place over medium heat.
As the sugar melts, gradually add the rest of the sugar in quarters, stirring constantly to ensure even melting.
Continue heating and stirring until all sugar is melted and turns a deep amber color.
Immediately remove from heat and add half of the room temperature unsalted butter, stirring until combined, then add the remaining butter.
Slowly pour in the warmed heavy cream while stirring.
Return the pot to medium heat and cook for 2 minutes to thicken slightly.
Remove from heat, then stir in the salt and cornflakes until everything is evenly combined.
I like to taste the caramel at this stage and adjust the salt to my liking for a perfect balance of sweet and salty.
Step 6: Assemble and Set the Cornflake Brownies
- baked brownies from Step 4
- salted caramel cornflake layer from Step 5
Once the brownies from Step 4 have cooled for about 10 minutes, spread the cornflake caramel layer from Step 5 evenly over the top.
Smooth the surface with a spatula.
Place the tin in the fridge and leave to set for at least 2 hours (though I prefer to leave it overnight for the best texture and flavor).
Step 7: Slice and Serve
When the brownies are fully set, remove them from the tin, slice into squares, and enjoy with friends and family.
These are perfect with a cup of coffee or as a decadent dessert.
Perfect Cornflake Brownie Bars
Ingredients
For the brownie base:
- 8 oz unsalted butter
- 5 oz dark chocolate
- 5 large eggs
- 3/4 cup packed brown sugar (180g)
- 3/4 cup granulated sugar (180g)
- 3.5 oz all-purpose flour
- 1.75 oz unsweetened cocoa powder
- 1/4 tsp salt
For the cornflake caramel layer:
- 2 1/2 cups granulated sugar (480g)
- 5.25 oz unsalted butter, room temperature (150g)
- 1 1/4 cups warmed heavy cream (300ml)
- 1 tsp salt, or to taste
- 7.75 oz cornflakes (220g)
Instructions
- Preheat your oven to 180°C (350°F). Grease and line a 9x12 inch cake tin with parchment paper to ensure your brownies come out easily after baking.
- In a pot over medium heat, combine the unsalted butter and dark chocolate. Stir gently until both have melted and the mixture is smooth. Alternatively, you can melt them together in the microwave in short bursts, stirring between each. Set aside and allow to cool.
- In a large bowl, add the eggs, packed brown sugar, and granulated sugar. Whip the mixture with an electric mixer or a whisk until it lightens in color and nearly doubles in volume. Carefully pour in the cooled melted butter and chocolate from Step 2, whisking to combine. Sift in the all-purpose flour, unsweetened cocoa powder, and salt. Whisk gently until a smooth batter forms, taking care not to overmix.
- Pour the brownie batter from Step 3 into your prepared cake tin. Smooth the top evenly. Bake in your preheated oven for 35–40 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs. Once done, remove from the oven and allow to cool for about 10 minutes.
- In a non-stick pot with high sides, add about a quarter of the granulated sugar and place over medium heat. As the sugar melts, gradually add the rest of the sugar in quarters, stirring constantly to ensure even melting. Continue heating and stirring until all sugar is melted and turns a deep amber color. Immediately remove from heat and add half of the room temperature unsalted butter, stirring until combined, then add the remaining butter. Slowly pour in the warmed heavy cream while stirring. Return the pot to medium heat and cook for 2 minutes to thicken slightly. Remove from heat, then stir in the salt and cornflakes until everything is evenly combined. I like to taste the caramel at this stage and adjust the salt to my liking for a perfect balance of sweet and salty.
- Once the brownies from Step 4 have cooled for about 10 minutes, spread the cornflake caramel layer from Step 5 evenly over the top. Smooth the surface with a spatula. Place the tin in the fridge and leave to set for at least 2 hours (though I prefer to leave it overnight for the best texture and flavor).
- When the brownies are fully set, remove them from the tin, slice into squares, and enjoy with friends and family. These are perfect with a cup of coffee or as a decadent dessert.
