Homemade Hazelnut Brittle Candy

Name: Homemade Hazelnut Brittle Candy
Prep time: 15 min
Cook time: 30 min
Total time: 75 min
Ingredients: 1 cup hazelnuts; 1 cup granulated white sugar; 1/2 cup light corn syrup; 1/4 cup water; 2 tablespoons unsalted butter; 1 teaspoon baking soda; 1 teaspoon vanilla extract; sea salt to sprinkle on top

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Homemade Hazelnut Brittle Candy is a quick and easy treat that makes a great gift, perfect snack, or sweet topping.

Stack of hazelnut brittle pieces on a white plate.

Growing up my aunt always made peanut brittle at Christmas time. While delicious, there are so many other nut varieties to explore. At the top of my list were hazelnuts.

Lightly toasted, nutty, creamy, and earthy hazelnuts are the perfect partner for crisp, sweet, caramelized sugar.

Why You Will Love This Recipe

Hazelnut brittle is the perfect treat for sweet and salty lovers.
There are so many ways to serve hazelnut brittle. Break it into pieces, dip it in chocolate, crush it in a blender and serve it on top of ice cream.
Easy to make hazelnut brittle makes an unexpected Christmas gift.

Need some more delicious Christmas candy ideas? Try this Honeycomb Brittle or this Whiskey Fudge.

What is brittle?

Brittle is a type of candy. It is basically melted, caramelized sugar that has been heated to the hard crack stage, approximately 305°F-310°F or 151°C-154°C and aerated with baking soda. Caramelized sugar is acidic, when you add baking soda it reacts and produces gas creating a bubbly mixture that is then poured over nuts and spread out to cool.

As it cools, it hardens and becomes shiny. Once it has completely cooled, it is broken into smaller pieces. It can be eaten as is, added to other recipes, or used as a topping for ice cream or creme brulee.

How Can You Monitor Sugar Stages Without a Thermometer?

Using a thermometer is the easiest way to monitor sugar's temperature as it cooks. If you don't have a candy or instant-read thermometer there is another way to test sugar's temperature using a glass of cold water.

Drop a teaspoon of the cooked sugar into a glass of cold water. Retrieve the sugar and examine it to determine the stage. The hotter the sugar the firmer it will be because more of the moisture has cooked out.

Use this chart below to determine what stage your sugar is at.

°F	Sugar Stage	Uses
223°F to 234°F	Thread: The sugar drips from a spoon and stretches into loose thin threads once it reaches the cold water.	Used for sugar syrups
235°F to 240°F	Soft ball: The sugar forms into a sticky soft malleable ball in cold water but flattens when removed from the water.	Fudge, pralines, fondant, buttercream, and caramels
245°F to 250°F	Firm ball: The sugar forms into a sticky ball in cold water, retains the ball shape when removed, but loses its shape when compressed.	Caramels, buttercream, nougat, marshmallows, Italian meringues, gummies, and toffees
250°F to 264°F	Hard ball: The sugar forms into a hard sticky ball in cold water and remains a ball when removed. It keeps its shape when compressed, but feels sticky.	Caramels, nougats, divinity, and toffees
270°F to 290°F	Soft Crack: The sugar forms into long threads in cold water. The threads are stretchy and slightly sticky when removed from the water.	Taffy, nougat, and butterscotch
298°F to 310°F	Hard Crack: The sugar forms into long threads in cold water. The threads are stiff, brittle, and easily snap when removed from the water.	Hard candy, brittles, toffees, glazed fruit, and spun sugar
320°F and up	Caramel: The sugar turns light golden yellow to dark amber. Nearly all water has been boiled out of the syrup. If sugar you continue to cook the sugar, it will burn and turn black	Pralines, brittles, and nougatine

Recipe Ingredients

Hazelnut brittle ingredients on a dark wood surface.

Hazelnuts: You can purchase already roasted and chopped hazelnuts or purchase whole hazelnuts and roast them yourself. The best price I have found is buying whole unroasted hazelnuts from the bulk bin at Fresh Thyme.

White Granulated Sugar: Sugar is caramelized and cooked until the hard crack stage, approximately 305°F-310°F or 151°C-154°C. That means that once the sugar cools it will solidify and snap into pieces easily. It should not be sticky or bendy.

Light Corn Syrup: Corn syrup helps to prevent the sugar from crystallizing as it melts.

Water: Water is used to dissolve the sugar.

Unsalted Butter: Butter helps to tenderize the candy and adds its own rich flavor. When baking I prefer to use unsalted butter so that I can control the amount of salt that is used.

Baking Soda: The addition of baking soda creates millions of microscopic bubbles in the candy. These bubbles make the caramelized sugar "brittle" so that it breaks when you bite it rather than being so hard you must suck on it like toffee or a lollipop.

Flaky Sea Salt: Before it hardens completely, I like to top my brittle with a sprinkle of flaky sea salt which provides a nice contrast to the sweet brittle. Maldon sea salt is one of the best.

See the recipe card for full information on ingredients and quantities.

Substitutions and Variations

Corn Syrup: If you don't have corn syrup, you can substitute an equal amount of honey, light molasses, agave, or brown rice syrup. Keep in mind that making a substitution will give the brittle a slightly different taste and texture.

Hazelnuts: Try substituting different types of nuts. Peanuts are a popular choice but cashews, macadamias, walnuts, and almonds will work well too.

Chocolate: After the brittle has hardened try drizzling it with some melted chocolate for an extra special treat.

Step by Step Directions

Step 1: Preheat oven to 350°F (180°C) with a rack in the topmost position.

Place the hazelnuts on a sheet pan and toast for 15 to 20 minutes until fragrant, stirring every 5 minutes to prevent burning.

Transfer toasted hazelnuts to a clean dishtowel. Rub and roll them around between your hands to remove the skins.

Remove the hazelnuts from the dishtowel and roughly chop. I like a variety of sized pieces.

Step 2: Line a baking sheet with a Silpat or parchment paper that has been coated in cooking spray.

In a large saucepan, combine the sugar, corn syrup, and water. Attach your candy thermometer to the edge of the saucepan, and make sure it is submerged in the liquid, but not touching the bottom of the pot.

Tip: A heavy-bottomed saucepan evenly distributes the heat reducing the likelihood that portions of the sugar will burn. I prefer to use a light-colored saucepan which allows me to easily monitor the color of the sugar. You can also use an enameled dutch oven.

Step 3: Heat the sugar mixture over medium-low heat. If you see sugar clinging to the sides of the pan, use a pastry brush dipped in water to brush down the sides of the pan. DO NOT STIR the sugar mixture. You may swirl the pan gently about halfway through the cooking time to incorporate any uncooked sugar.

Simmer without stirring until the caramel is 305°F (151°C) and deep amber in color. Roughly 10 to 15 minutes.

Chopped hazelnuts resting on caramelized sugar.

Step 4: Remove the saucepan from the heat and add the hazelnuts, butter, baking soda, and vanilla. Stir until all of the hazelnuts are evenly coated with the syrup.

Hazelnut brittle poured onto a sheet pan.

Step 5: Pour the hazelnut mixture onto the prepared baking sheet.

Tip: Be sure to remove the caramelized sugar from the heat before adding the baking soda. Otherwise, it will foam up and overflow from the saucepan. Even off the heat, be prepared once the baking soda has been added the syrup will begin to foam, often reaching two to three times its original volume.

Hazelnut brittle being spread out with a rubber spatula.

Step 6: Use a rubber spatula that has been sprayed with cooking spray to spread the mixture into an even layer about ½ inch thick.

Sprinkle with sea salt and allow the brittle to cool for at least 30 minutes.

Broken pieces of hazelnut brittle on a sheet pan.

Step 7: Once the brittle has hardened break it into pieces.

Tip: Spraying the rubber spatula with cooking spray will keep the brittle from sticking to the spatula.

Recipe FAQs

What's the difference between brittle and praline?

Brittle is cooked to the hard crack stage while pralines are normally only taken up to the soft-ball stage. Pralines have a fudge-like or chewy texture, while brittle is hard and crunchy.

Why did my brittle turn out chewy?

Brittle can turn out chewy if it wasn't heated to a high enough temperature. Sugar for brittle needs to be heated to the hard crack stage or between 305°F-310°F or 151°C-154°C.

If your brittle was hard when you first made it but then became chewy, moisture is most likely the cause. High humidity can cause brittle to soften.

How long does it take brittle to harden?

After pouring the sugar onto the baking sheet it should cool and fully harden in 20-30 minutes. Allow the brittle to cool at room temperature. Do not refrigerate brittle. The moisture in the refrigerator could keep it from fully hardening.

How do you store brittle?

Because brittle is hard candy so moisture is the enemy. Do not store brittle in the refrigerator. It is best stored in an airtight container at room temperature for 6-8 weeks. If you are worried about the brittle sticking together you can separate each layer with a piece of parchment paper.

Brittle can also be frozen. Freeze brittle in an airtight container for up to three months.

What is the easiest way to clean up after making brittle?

Sugar quickly dissolves in boiling water. The easiest way to clean your pan is to boil some water in it. I will also hold any utensils I used in the boiling water until the sticky sugar has dissolved.

Stella Parks writes about an interesting technique on Serious Eats. In the article, she suggests boiling other ingredients like heavy cream or coffee in the pan to dissolve the sugar and using that liquid as the base for another recipe.

Expert Tips

Prep your baking sheet and ingredients before you begin caramelizing the sugar. Once the sugar begins to caramelize the process moves quickly.
Don't stir the sugar. Stirring the sugar will encourage sugar crystallization which will make your brittle grainy.
Don't wander away from the sugar while it is caramelizing. It will go from the perfect shade of brown to burned quickly.
Melted sugar is extremely hot! In fact, sugar has a higher boiling point than water. Don't touch the melted sugar and be careful to not drop any on your skin. I usually wear oven mitts when pouring the melted sugar onto the baking pan. Don't use your fingers to taste or stop drips!

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