Cashew brittle is the kind of sweet you make when you want something crisp, nutty, and a little nostalgic. It’s quick, it uses simple ingredients, and it tastes like a gift shop specialty—without the price tag. You don’t need a candy-making background to pull it off, just a steady eye and a few clear steps.
The payoff is a glassy, golden crunch with rich roasted cashews in every bite. Make a batch for holidays, hostess gifts, or when you just want a reliable, crowd-pleasing treat.
Why This Recipe Works
- Balanced sweetness: The sugar, corn syrup, and butter create a caramel that’s sweet, but not cloying, letting the cashews shine.
- Perfect texture: Baking soda adds tiny air pockets, so the brittle snaps instead of feeling like a jawbreaker.
- Cashew-forward flavor: Cashews bring a buttery richness and soft crunch that pairs beautifully with caramel.
- Foolproof method: Using a candy thermometer helps you hit the right stage for brittle—no guesswork.
- Quick finish: The process goes fast at the end, so you can make it start to finish in about 30 minutes (plus cooling).
Shopping List
- Granulated sugar – the base of the brittle
- Light corn syrup – prevents crystallization and adds shine
- Unsalted butter – for flavor and silkiness
- Roasted, unsalted cashews – whole or lightly chopped
- Baking soda – for lift and delicate texture
- Vanilla extract – optional but adds warmth
- Kosher salt – balances sweetness (or flaky sea salt for finishing)
- Water – helps the sugar dissolve evenly
Step-by-Step Instructions
- Prep your tools. Line a baking sheet with a silicone mat or lightly buttered parchment. Lightly oil a heatproof spatula.
Keep your baking soda, vanilla, and cashews measured and ready. Things move quickly once the syrup is hot.
- Combine the base. In a medium heavy-bottomed saucepan, add 1 cup granulated sugar, 1/2 cup light corn syrup, 1/4 cup water, and 2 tablespoons unsalted butter. Stir gently just to moisten the sugar.
- Heat without stirring. Set the pan over medium heat.
Clip on a candy thermometer. Let the mixture come to a boil without stirring to avoid crystallization. If crystals form on the sides, brush them down with a wet pastry brush.
- Watch the temperature. Cook until the syrup reaches about 300°F (hard crack).
This typically takes 8–12 minutes depending on your stove and pan. The color should be a deep golden amber, not dark brown.
- Add the cashews. Remove the pan from heat briefly and stir in 1 1/2 to 2 cups roasted, unsalted cashews. Return to heat for 15–30 seconds, stirring to coat and warm the nuts.
This helps distribute them evenly.
- Flavor and aerate. Take the pan off the heat. Stir in 1 teaspoon vanilla and 3/4 teaspoon baking soda. The mixture will foam and lighten.
Work quickly but carefully.
- Pour and spread. Immediately pour onto the prepared baking sheet. Use the oiled spatula to gently nudge the brittle into an even layer about 1/4 inch thick. Don’t overwork it; let the bubbles stay for a lighter snap.
For extra contrast, sprinkle a pinch of flaky sea salt on top.
- Cool completely. Let the brittle sit at room temperature for 20–30 minutes until fully firm. Avoid the fridge; moisture can make it sticky.
- Break into pieces. Lift the set slab and crack it into shards with your hands. Store in an airtight container right away to keep it crisp.
How to Store
- Airtight is everything: Keep brittle in a sealed container at room temperature.
Humidity is the enemy.
- Layer smartly: If stacking, separate layers with parchment to prevent sticking.
- Shelf life: Stays crisp for 2–3 weeks if well sealed. If it softens, it’s usually from moisture in the air.
- Do not refrigerate: The fridge introduces moisture and makes brittle tacky.
- Freezing: Not recommended. The texture suffers when thawed.
Benefits of This Recipe
- Fast and festive: Great for last-minute gifting or a quick dessert addition.
- Simple pantry staples: No tricky ingredients; most items are common and affordable.
- Customizable: Easy to swap nuts, add spices, or finish with chocolate.
- Naturally gluten-free: A safe sweet for many guests (always check labels).
- Portion-friendly: Break into any size—small bites for grazing or big shards for wrapping.
Pitfalls to Watch Out For
- Undercooking the syrup: If you pour before it reaches hard crack (around 300°F), the brittle may be chewy instead of snappy.
- Overcooking to dark brown: Pushing past amber can make it bitter.
Watch closely in the final minutes.
- Stirring too much early on: Agitation during the early boil can encourage crystallization and graininess.
- Skipping the baking soda: You’ll miss the tiny air bubbles that create an easy snap.
- Working slowly at the end: Once baking soda goes in, you need to pour and spread quickly before it sets.
- Humidity: Making brittle on a very humid day can affect texture. Aim for a dry day or run a dehumidifier if possible.
Alternatives
- Nut swaps: Peanuts, almonds, or pecans work well. For almonds, try adding a pinch of cinnamon.
- Flavor twists: Add 1/2 teaspoon ground cardamom, pumpkin pie spice, or espresso powder with the vanilla.
- Chocolate drizzle: Once cooled, drizzle melted dark or milk chocolate over the brittle and let set.
- Salted caramel vibe: Finish with flaky sea salt.
It sharpens the sweetness and highlights the cashews.
- Honey edge: Replace up to 2 tablespoons of corn syrup with honey for floral notes. Don’t swap entirely or it may crystallize.
- Dairy-free: Use a neutral oil instead of butter and confirm your sugar is suitable for your diet.
FAQ
Do I really need a candy thermometer?
A thermometer makes this recipe more reliable. Hard crack stage is key for that crisp snap, and eyeing the color alone can be risky.
If you don’t have one, look for a deep amber color and test a drop in ice water—it should harden and snap cleanly.
Why is my brittle cloudy or grainy?
That usually means the sugar crystallized. Avoid stirring once it starts boiling, and dissolve any crystals on the pan sides with a wet brush. Corn syrup helps prevent this, so don’t skip it.
Can I use salted cashews?
Yes, but reduce or omit added salt.
Taste the cashews first; some brands are quite salty. You can always add a pinch of flaky salt on top if needed.
How do I clean the pan after making brittle?
Fill the pan with hot water and let it soak. The hardened sugar will dissolve.
For stubborn spots, bring the water to a simmer and the residue will melt away.
Can I double the recipe?
You can, but use a larger, heavy-bottomed pot because the syrup foams when baking soda is added. Work quickly when pouring—larger batches set fast.
What if I don’t have corn syrup?
Golden syrup can work in a pinch, though the flavor and color will be slightly different. Avoid using only honey or only maple; they crystallize more easily and can burn faster.
How thin should I spread the brittle?
Aim for about 1/4 inch thick.
Too thin and it can shatter into tiny pieces; too thick and it can be hard to bite. Spread gently to keep the airy texture.
Can I add seeds or coconut?
Yes. Toasted sesame seeds or shredded coconut are great add-ins.
Stir them in with the cashews for even distribution.
Wrapping Up
Cashew brittle is one of those classic treats that feels special but takes only a short window of focus. With the right temperature, a quick hand, and a handful of buttery cashews, you’ll get a beautiful, glossy candy that snaps cleanly and tastes like a holiday tradition. Keep a jar on the counter, gift a bag to a neighbor, or crumble some over ice cream.
It’s simple, impressive, and always welcome.
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