Cashew Brittle Recipe With Easy Storage Tips

The most reliable cashew brittle recipe reaches 300°F (149°C) for a crisp, glass-like finish, then cools undisturbed for at least 45 minutes before storage. Use a heavy saucepan, a calibrated candy thermometer, roasted cashews, and airtight packaging with a moisture barrier; humidity is the main reason brittle turns sticky.

This recipe makes approximately 1¾ pounds of brittle, enough for a large serving platter or about 24 pieces. It is designed for ordinary home kitchens and outdoor entertaining, but the candy should be cooked indoors and kept shaded after serving because heat and moisture quickly soften the sugar structure.

Cashew Brittle Recipe at a Glance

Ingredients

• 2 cups granulated sugar, about 400 grams
• ½ cup light corn syrup, about 160 grams
• ½ cup water, 120 grams
• 2 tablespoons unsalted butter, 28 grams, plus a little for greasing
• 1½ cups roasted, unsalted cashews, about 200 grams
• 1 teaspoon vanilla extract
• 1 teaspoon baking soda, about 5 grams
• ½ teaspoon fine salt, or omit if the cashews are salted

You will also need a heavy 3-quart saucepan, a heatproof spatula or wooden spoon, a candy thermometer, a rimmed baking sheet measuring approximately 13 by 18 inches, parchment paper or a silicone baking mat, and heat-resistant gloves or oven mitts. The mixture is extremely hot and can cause serious burns, so keep children and pets away from the work area.

How to Make Cashew Brittle

1. Prepare the tray and cashews

Line the baking sheet with parchment paper or a silicone baking mat and lightly grease the surface. Measure every ingredient before starting. Warm the cashews in a 200°F (95°C) oven for 8–10 minutes, or place them in a dry skillet over low heat for 3–4 minutes.

Warm nuts are less likely to cool the syrup abruptly when added. They also remain easier to spread through the finished candy. Do not use hot or browned nuts; the goal is gentle warming, not additional roasting.

2. Dissolve the sugar mixture

Combine the sugar, corn syrup, and water in the saucepan. Set the pan over medium heat and stir only until the sugar looks wet and begins dissolving. Brush any sugar crystals from the sides of the pan with a wet pastry brush, or cover the pan for 1–2 minutes so steam can wash them down.

Once the mixture reaches a full boil, stop stirring. Continued stirring can encourage crystals, producing a grainy rather than smooth brittle. Keep the mixture at a steady boil until it reaches approximately 260°F (127°C), which usually takes 10–15 minutes depending on the pan and burner.

3. Add butter, salt, and cashews

At 260°F, carefully add the butter, salt, and warm cashews. Stir slowly and continuously with a heatproof spatula. The temperature may drop by 10–25 degrees, and the syrup will become thicker as the nuts are coated.

Continue cooking while stirring until the mixture reaches 285°F (140°C). This intermediate target helps the nuts heat through before the syrup reaches its final hard-crack temperature. If your cashews are already heavily roasted, stir gently to prevent scorching.

4. Cook to the hard-crack stage

Raise the heat slightly if necessary and continue cooking until the thermometer reads 300°F (149°C). The syrup should be golden to light amber and smell nutty, not smoky. Remove the pan from the heat immediately at 300°F; carryover heat can push it several degrees higher.

A calibrated candy thermometer is more dependable than color alone. To check it, place the thermometer in simmering water; at sea level it should read close to 212°F (100°C). If it is off by 3 degrees, adjust the final target accordingly. For example, a thermometer reading 3 degrees low should be removed from the candy at an indicated 297°F.

5. Finish and spread the candy

Immediately stir in the vanilla and baking soda. The mixture will foam and expand, so pour slowly and keep your face and hands away from the steam. Stir only long enough to distribute the ingredients, usually 10–15 seconds.

Pour the candy onto the prepared tray. Use a greased spatula to spread it to approximately ¼ inch thick. Do not overwork it: repeated scraping can create cloudy patches and uneven thickness. A thinner layer cools faster and gives a clean snap, while a layer thicker than ⅜ inch may be difficult to bite and can retain warmth in the center.

6. Cool completely before breaking

Leave the tray flat at room temperature for 45–60 minutes. Do not refrigerate the brittle while it is hot, because condensation can form on the surface and introduce moisture. The candy is ready when it feels hard in the center and no longer flexes when lifted at an edge.

Break it into pieces by hand or tap the underside of the tray gently. If the brittle remains soft after an hour, the syrup probably did not reach 300°F, or the room is unusually humid. Soft pieces can be placed on a parchment-lined tray in a 200°F (95°C) oven for 10–15 minutes, then cooled again, although this may darken the nuts and sugar.

Humidity-Aware Storage Tips

Hard-crack candy is hygroscopic, meaning it absorbs water vapor from the air. In a dry room, the sugar remains rigid; in humid weather, its surface becomes tacky first, followed by a chewy or sticky texture throughout. This matters especially for patio service, where warm air, dew, and uncovered serving dishes can shorten the crispness window.

• Cool before packing: Wait at least 45 minutes, and pack only when the pieces are completely firm and no longer warm.
• Use a moisture barrier: Wrap individual pieces in waxed paper, cellophane candy wrappers, or parchment before placing them in a container.
• Choose a tight seal: A rigid airtight container with a silicone gasket is preferable to a loosely covered bowl. Leave as little empty air space as practical.
• Add a food-safe desiccant when appropriate: A packaged food-grade silica-gel packet can help in a dry-storage container, but it must remain sealed and must never touch unwrapped candy.
• Keep it cool and shaded: Store at approximately 60–70°F (16–21°C), away from sunlight, grills, heaters, and warm windows.
• Do not store it beside moist foods: Fresh fruit, bread, cakes, and refrigerated items release moisture that can migrate into the brittle.
• Open the container briefly: Each opening replaces dry container air with humid room air. Take out what you need and reseal promptly.

In a dry climate, well-wrapped brittle can remain crisp for about two weeks. In a humid climate, expect the best texture for approximately 3–7 days unless every piece is wrapped and the container seals exceptionally well. Refrigeration is usually a poor choice because the cold candy can collect condensation when removed. If refrigeration is unavoidable, keep the package sealed until it reaches room temperature.

Storage Options Compared

Worked Batch and Serving Calculation

The recipe uses approximately 400 grams of sugar, 160 grams of corn syrup, 120 grams of water, 28 grams of butter, and 200 grams of cashews. Much of the water evaporates during cooking, leaving roughly 780–820 grams of finished candy after the vanilla and baking soda are added.

At 24 pieces, that produces approximately 32–34 grams per piece. At 30 smaller pieces, each portion is approximately 26–27 grams. The exact weight varies with how thinly the brittle is spread and how much candy remains on the saucepan and spatula.

Troubleshooting Texture and Appearance

Why is my brittle chewy instead of crisp?

The syrup most likely stopped below the hard-crack stage, or the finished candy absorbed moisture. Cook to 300°F (149°C), verify the thermometer, and cool the brittle completely before sealing it. If the weather is humid, wrap pieces individually rather than storing them loose.

Why did the brittle turn grainy?

Sugar crystals may have formed on the side of the pan or been reintroduced by stirring after the syrup began boiling. Dissolve the sugar completely before boiling, wash down the pan sides, and stop stirring once a full boil begins. Corn syrup also helps inhibit crystallization, but it cannot correct aggressive stirring or undissolved sugar.

Why is the brittle dark or bitter?

It was probably cooked past the target temperature, or the nuts scorched against the bottom of the pan. Remove the pan at 300°F because residual heat continues cooking the syrup, and use medium rather than high heat. A heavy-bottomed saucepan distributes heat more evenly.

Why did my brittle not foam when I added baking soda?

Baking soda reacts with the hot acidic syrup and releases carbon dioxide, creating small bubbles. If the candy had cooled too much before the soda was added, the reaction may be weaker. Measure the soda accurately and stir it in immediately after removing the pan from the heat.

Frequently Asked Questions

Can I make this cashew brittle recipe without corn syrup?

Yes, but the texture and crystallization risk change. Replace the corn syrup with an equal weight of liquid glucose or golden syrup if available; honey can also work, but it adds a distinct flavor and may darken more quickly. Avoid simply increasing the water, because extra water increases cooking time without providing the same crystallization control.

What temperature should cashew brittle reach?

Cook the syrup to 300°F (149°C), the upper portion of the hard-crack stage. Remove it immediately from the heat and account for carryover cooking. At high elevations, water boils at a lower temperature, so reduce the target by approximately 2°F for every 1,000 feet above sea level, then confirm the adjustment with your thermometer and local conditions.

Can I use salted cashews?

Yes. Use salted roasted cashews and omit the added ½ teaspoon of salt, or reduce it to a small pinch if you want a more pronounced sweet-salty flavor. Taste cannot be checked once the candy is hot, so begin conservatively; you can always sprinkle a little flaky salt over the surface immediately after spreading.

How long should brittle cool before breaking?

Allow at least 45 minutes at room temperature, with 60 minutes being safer for a thicker layer or a cool kitchen. Breaking it early can bend the candy, expose warm syrup, and increase moisture absorption. It should be hard throughout and should not flex noticeably in the center.

Can I serve cashew brittle outdoors on a patio?

Yes, but put it out shortly before serving and keep it in a shaded, covered container. Avoid placing it beside a grill, ice bucket, misting fan, or cold drinks, since heat and condensation can soften the candy. For humid weather, serve individually wrapped pieces and return extras to an airtight container between servings.