How to Make Hazelnut Brownies
If you want brownies with deeper flavor than a standard chocolate version, hazelnuts add toastiness, crunch, and a subtle nutty aroma.
This guide shows how to make hazelnut brownies that stay fudgy in the center, slice cleanly, and taste bakery-quality at home.
What makes hazelnut brownies different?
Hazelnuts pair naturally with cocoa, dark chocolate, and butter because they bring a roasted, slightly sweet flavor that complements rich chocolate rather than overpowering it.
In brownies, they can be used as chopped nuts, hazelnut flour, hazelnut spread, or a combination of all three.
The best versions balance three things:
- Fudginess from the right ratio of fat, sugar, and eggs
- Structure from flour and eggs so the brownies hold together
- Hazelnut flavor from toasted nuts or hazelnut spread
Ingredients you need
This recipe uses easy pantry ingredients and one star ingredient: hazelnuts.
Toasting them first improves both aroma and flavor.
- Unsalted butter for richness
- Dark chocolate or semisweet chocolate for a deep cocoa base
- Granulated sugar for sweetness and a shiny top
- Brown sugar for moisture and a light caramel note
- Eggs for structure and chew
- All-purpose flour for a dense brownie crumb
- Unsweetened cocoa powder for stronger chocolate flavor
- Salt to sharpen the flavor
- Vanilla extract to round out the chocolate
- Hazelnuts, toasted and chopped
- Hazelnut spread or hazelnut flour, optional for extra flavor
How to make hazelnut brownies step by step
1. Toast the hazelnuts
Spread the hazelnuts on a baking sheet and toast them at 350°F until fragrant, usually 8 to 10 minutes.
Rub them in a clean towel to remove loose skins, then chop them roughly.
Toasting matters because raw hazelnuts can taste mild and slightly dusty, while toasted hazelnuts taste fuller and more aromatic.
2. Prepare the pan
Line an 8-inch or 9-inch square baking pan with parchment paper, leaving a slight overhang for easy lifting.
Lightly grease the paper and pan to prevent sticking.
An overlined pan makes slicing much easier and helps preserve the brownie edges.
3. Melt the chocolate and butter
In a heatproof bowl, melt the butter with chopped chocolate over a double boiler or in short microwave bursts.
Stir until smooth, then let it cool slightly so it does not scramble the eggs later.
If you want a more intense chocolate profile, choose a chocolate bar with 60 to 70 percent cacao.
4. Mix the sugar and eggs
Whisk the granulated sugar, brown sugar, eggs, and vanilla until the mixture looks slightly thick and glossy.
This helps create that familiar brownie crust on top.
Do not rush this step.
A well-whisked egg-sugar mixture improves texture and sheen.
5. Combine wet and dry ingredients
Stir the melted chocolate mixture into the egg mixture.
Then fold in the flour, cocoa powder, and salt just until no dry streaks remain.
Overmixing develops gluten and can make brownies cakier.
Stop as soon as the batter looks uniform.
6. Add hazelnuts
Fold in most of the chopped hazelnuts, reserving a handful for the top.
If using hazelnut spread, swirl a few spoonfuls into the batter with a knife for visible ribbons.
This is where the flavor becomes clearly hazelnut-forward.
The goal is even distribution without losing the fudgy brownie texture.
7. Bake
Spread the batter evenly in the pan and sprinkle the remaining hazelnuts on top.
Bake at 350°F until the edges are set and the center looks slightly underdone but not wet, usually 22 to 30 minutes depending on your pan and oven.
A toothpick inserted near the center should come out with moist crumbs, not raw batter.
If you wait until the toothpick is completely clean, the brownies may end up dry.
8. Cool before slicing
Let the brownies cool completely in the pan, then chill briefly if you want especially neat slices.
Use a sharp knife wiped clean between cuts.
Brownies continue to set as they cool, so patience pays off with a fudgier result.
Tips for the best fudgy texture
- Use more chocolate and butter than flour.
- Measure flour accurately by spooning and leveling it.
- Pull the brownies from the oven while the center still has some softness.
- Let them cool fully before cutting.
- Choose chopped hazelnuts over large pieces for a more even bite.
If you prefer extra richness, replace a small portion of the flour with hazelnut flour.
This adds flavor while keeping the crumb tender.
How to make hazelnut brownies more chocolatey
Hazelnuts already pair well with chocolate, but you can deepen the flavor further with a few adjustments:
- Add an extra tablespoon of cocoa powder.
- Use dark chocolate instead of semisweet chocolate.
- Mix in chocolate chunks for pockets of melted chocolate.
- Finish with a pinch of flaky salt to enhance the cocoa notes.
For a dessert that tastes close to a hazelnut truffle, swirl in hazelnut spread and top with chopped toasted nuts.
Common mistakes to avoid
- Skipping the toast: Untoasted hazelnuts can taste flat.
- Using too much flour: This makes brownies dry and cakey.
- Overbaking: Brownies should remain soft in the center when removed from the oven.
- Adding nuts too early to hot batter: They can sink if the batter is too loose.
- Slicing too soon: Warm brownies tend to crumble and smear.
Variations you can try
Hazelnut spread brownies
Swirl hazelnut spread through the batter before baking for a sweet, creamy ribbon effect.
This version is especially popular for people who enjoy Nutella-style flavor.
Hazelnut flour brownies
Replace a small portion of the all-purpose flour with hazelnut flour for a more pronounced nut flavor and a slightly softer crumb.
Salted hazelnut brownies
Finish the top with flaky sea salt after baking.
The salt sharpens the chocolate and balances the sweetness.
Espresso hazelnut brownies
Add instant espresso powder to the batter to intensify the chocolate notes without making the brownies taste like coffee.
How to store and serve hazelnut brownies
Store cooled brownies in an airtight container at room temperature for up to 3 days.
For longer storage, refrigerate them for about a week or freeze them for up to 3 months.
To serve, pair them with vanilla ice cream, whipped cream, or a drizzle of warm chocolate sauce.
If you want a more elegant finish, add extra toasted hazelnuts on top just before serving.
FAQ about making hazelnut brownies
Can I use roasted hazelnuts from the store?
Yes, but check whether they are salted.
Unsalted roasted hazelnuts work best because they give you more control over the final flavor.
Can I make hazelnut brownies gluten-free?
Yes, you can use a 1:1 gluten-free baking flour blend or incorporate more hazelnut flour, though texture may vary by brand.
Can I make these brownies ahead of time?
Yes.
Brownies often taste even better the next day because the chocolate and hazelnut flavors have time to settle and deepen.
