Easy No-Bake Chocolate Peanut Butter Cornflake Bars

These Butterfinger Bars are the kind of old-fashioned, no-fuss treat that earns a permanent spot in the recipe box. Crunchy cornflakes are coated in a warm, sticky mixture of peanut butter, sugar, and corn syrup, creating chewy-crisp bars with plenty of sweet, nutty flavor. A layer of melted chocolate on top gives them that familiar chocolate-and-peanut-butter candy bar appeal.

I especially like these for school breaks, potlucks, and busy afternoons because the base comes together in minutes and requires no baking. They remind me of peanut butter cereal treats, but the cornflakes give every bite a lighter, crispier texture. My kids would happily grab these straight from the pan before the chocolate had completely set, so allowing enough cooling time is probably the hardest part of the recipe. The original collected recipe uses just five ingredients and takes about 15 minutes of active prep and cooking.

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Ingredients

Peanut Butter Cornflake Base

10 cups cornflakes cereal

1 cup light corn syrup

1 cup granulated sugar

1 cup smooth peanut butter

Chocolate Topping

10 oz semisweet chocolate, finely chopped (Optional)

Instructions

1. Prepare the pan. Lightly butter a 9-by-13-inch pan and set it aside.
2. Heat the syrup mixture. Add the corn syrup and sugar to a medium saucepan. Cook over medium heat, stirring constantly, just until the mixture reaches a boil. Do not continue boiling it.
3. Add the peanut butter. Immediately remove the saucepan from the heat. Stir in the peanut butter until completely smooth and evenly combined.
4. Coat the cornflakes. Place the cornflakes in a large mixing bowl. Pour the warm peanut butter mixture over the cereal and gently fold until the cornflakes are thoroughly coated.
5. Press into the pan. Transfer the mixture to the prepared pan. With lightly buttered hands or a buttered spatula, gently press it into an even layer. Avoid packing it too firmly, which can make the finished bars hard.
6. Cool the base. Let the cornflake mixture cool at room temperature while you prepare the chocolate.
7. Melt the chocolate. Place the chopped chocolate in a heatproof bowl over a saucepan containing gently simmering water. Keep the water around 85°C / 185°F and make sure the bowl does not touch it. Stir until the chocolate is smooth.
8. Finish the bars. Spread the melted chocolate evenly over the cooled cornflake layer. Leave at room temperature until the chocolate has completely set, then cut into 24 bars.

Cooking Notes

Don’t overboil the sugar mixture. Once the corn syrup and sugar reach a boil, remove the pan from the heat. Extended boiling can produce bars that are unnecessarily hard once cooled.

Fold gently. Cornflakes crush easily. A large bowl and folding motion help preserve their crisp texture.

Choose your chocolate. Semisweet chocolate balances the very sweet cereal base particularly well. Milk chocolate works, too, but produces a sweeter bar.

For cleaner slices: Let the chocolate set completely before cutting. Use a sharp knife and wipe the blade between cuts when necessary.

Storage: Keep the bars in an airtight container at room temperature for about three to four days. Separate layers with parchment or wax paper.

Nutrition

Yields: 24 bars

Recommended Serving Size: 1 bar, approximately 2 ounces

The original recipe lists 12 servings and a yield of 24 bars; for a rich dessert like this, one of the 24 bars is a more practical individual serving. Nutrition will vary considerably with the brand of cornflakes, peanut butter, and chocolate used.

Estimated Nutrition per Serving

Calories: 260 kcal
Fat: 9.0 g
Carb: 43.0 g
Protein: 4.5 g

Recipe Science

These bars combine cornflakes with a concentrated peanut butter-sugar binder, followed by an optional chocolate topping. Unlike baked cereal bars, the structure develops as the cooked syrup mixture cools. Cornflakes provide a large amount of crisp surface area without making the finished dessert excessively dense.

Heating the corn syrup and granulated sugar dissolves the sugar and creates a cohesive syrup. Peanut butter contributes fat, protein, roasted flavor, and additional body. Stopping the cooking shortly after boiling is important because excessive water loss increases the final sugar concentration and can make the bars hard rather than pleasantly chewy. The chocolate topping solidifies separately, providing a contrasting smooth texture and deeper cocoa flavor.

These bars are practical for parties and make-ahead desserts because no oven is required, and the finished pieces travel well once completely set. Creamy conventional peanut butter gives the most predictable texture; natural peanut butter can work, but oil separation may affect consistency. For storage, keep the bars airtight and avoid excessive heat, which can soften the chocolate.

Dietary Notes & Health Alerts: This is a calorie-dense dessert containing substantial added sugar. Corn syrup, granulated sugar, and most semisweet chocolates all contribute added sugars, so a serving can approach or exceed the FDA’s 20% Daily Value threshold for added sugar, depending on the chocolate used. Keeping portions to one of 24 bars helps moderate intake. Peanut butter is also a major allergen; for people with peanut allergies, these bars should not be served unless an appropriate allergy-safe substitution is used.

Why You’ll Love This Recipe

• No Oven Needed: Everything comes together on the stovetop, making these especially convenient when you need a quick dessert.
• Five Simple Ingredients: The ingredient list is short, familiar, and easy to shop for.
• Sweet and Salty Flavor: Peanut butter balances the sweetness of the syrup and chocolate.
• Irresistible Crunch: Cornflakes create a crisp, craggy texture that makes these different from traditional crispy rice treats.
• Great for Sharing: One 9-by-13-inch pan makes 24 small bars, ideal for parties, bake sales, and lunchbox treats.

FAQ

• Can I use crunchy peanut butter? Yes. It will add extra peanut pieces and texture, although smooth peanut butter produces the most cohesive bars.
• Why did my bars turn out hard? The sugar mixture was probably cooked too long or the cereal was packed too firmly into the pan. Bring the syrup only to a boil, then remove it from the heat.
• Can I make them without chocolate? Absolutely. The chocolate topping is optional, and the peanut butter cornflake base will still set into bars.
• Can I make these ahead? Yes. Make them a day before serving and keep them covered at room temperature once completely cooled.
• Can I refrigerate the bars to set them faster? You can briefly chill them, but prolonged refrigeration may make the bars firmer and can cause condensation on the chocolate when they return to room temperature.

Conclusion

These Chocolate Peanut Butter Cornflake Bars prove that a keeper doesn’t have to be complicated. A handful of pantry staples can turn into something crunchy, chewy, chocolatey, and wonderfully nostalgic, and there’s always room to adjust the topping or portion size to make the recipe your own.

What’s your favorite addition to peanut butter bars; extra chocolate, chopped peanuts, or a sprinkle of flaky salt? Happy cooking, and enjoy every bite!