Triple Decker Hazelnut Brownies Recipe

There is something irresistibly indulgent about Triple Decker Hazelnut Brownies, a dessert that brings together a crumbly hazelnut crust, a dense and fudgy chocolate brownie center, and a luscious hazelnut-infused frosting all crowned with a glossy chocolate glaze. Each layer plays its part perfectly, offering a harmony of textures and flavors that make these brownies a show-stopping treat for any occasion. Whether you’re craving a rich snack or a decadent dessert, these brownies deliver an unforgettable experience that you’ll want to share with every friend and family member.

Ingredients You’ll Need

The beauty of making Triple Decker Hazelnut Brownies lies in the simplicity and quality of the ingredients. Each component contributes to a distinct layer, building on flavor and texture in a way that elevates this dessert beyond the average brownie. From the toasted hazelnuts adding crunch and nuttiness to the rich chocolate and fragrant Frangelico, these simple ingredients come together like magic.

• Light brown sugar: Adds a subtle molasses note and moisture to both crust and brownie layers.
• Unsalted butter: Essential for richness and a silky texture in the crust, brownies, and frosting.
• All-purpose flour: Provides structure across crust and brownie layers without overpowering their tenderness.
• Roasted hazelnuts: Finely chopped in the crust and brownies, lending a toasty crunch and signature nutty flavor.
• Unsweetened and semi-sweet chocolate: The core of the brownie and glaze, delivering deep chocolate intensity.
• Granulated sugar and powdered sugar: Balance sweetness between layers and create the perfect frosting consistency.
• Eggs: Bind the brownie batter into a fudgy, moist texture.
• Vanilla extract and espresso powder: Enhance chocolate flavor with warm, aromatic undertones; espresso is optional but highly recommended.
• Frangelico or Kahlua: Adds a sophisticated hazelnut or coffee liqueur note that elevates the entire dessert.
• Heavy cream or whole milk: Used to adjust frosting texture, keeping it smooth and spreadable.
• Refined coconut oil: Helps give the glaze a shiny finish and smooth texture without flavor interference.

How to Make Triple Decker Hazelnut Brownies

Step 1: Prepare the Hazelnut Crust

Start by preheating your oven to 350 degrees and preparing a 9-inch square pan with cooking spray and parchment paper. This crust layer is the foundation and features a lovely toasty flavor thanks to finely chopped roasted hazelnuts mixed into a buttery, lightly sweetened dough. Press this mixture firmly into the pan to form a solid base that will hold up beautifully to the rich brownie and creamy frosting above.

Step 2: Mix and Bake the Brownie Layer

In this step, melt butter and unsweetened chocolate together until smooth, then cool slightly. Whisk eggs, granulated sugar, brown sugar, vanilla, and espresso powder before blending in the chocolate mixture and Frangelico liqueur, which infuses the brownies with an irresistible nutty essence. Folding in flour, salt, and hazelnuts gently creates the perfect fudgy batter. Pour it over the crust and bake until just set—a moist but firm bite is what you want.

Step 3: Whip Up the Hazelnut Frosting

While the brownies cool, whip the butter until creamy before gradually adding powdered sugar, more Frangelico, cream, and a pinch of salt. This frosting is a sweet, velvety layer that complements the dense brownie beneath with its light and fluffy texture. If it gets too stiff, a little more liqueur or milk will make spreading a dream.

Step 4: Prepare and Apply the Chocolate Glaze

The final touch is a shiny glaze made by melting semi-sweet and unsweetened chocolate with coconut oil. This glossy layer seals in all the flavors, adds slight crispness, and provides a stunning finish. After spreading the glaze evenly over the chilled frosting, refrigerate until set, then slice into bars that show off the beautiful triple layers.

How to Serve Triple Decker Hazelnut Brownies

Garnishes

To really impress, sprinkle some chopped toasted hazelnuts or a dusting of cocoa powder on top of the set glaze. You can also add a pinch of flaky sea salt to elevate the chocolate’s richness with a touch of savory contrast. These little touches bring out the layers and emphasize the nutty character of the brownies.

Side Dishes

These brownies pair wonderfully with simple accompaniments like a scoop of vanilla bean ice cream or a dollop of lightly sweetened whipped cream. For a festive touch, serve alongside fresh raspberries or strawberries whose tartness balances the richness perfectly. A warm cup of espresso or hazelnut coffee will also round out the experience beautifully.

Creative Ways to Present

If you want to wow guests, try cutting the brownies into small bite-sized squares arranged on a slate board sprinkled with powdered sugar and extra hazelnuts. Another fun idea is to stack the brownies and serve as mini layered cakes with a drizzle of caramel sauce. No matter how you serve them, these Triple Decker Hazelnut Brownies make for a stunning centerpiece.

Make Ahead and Storage

Storing Leftovers

Once cut, keep your Triple Decker Hazelnut Brownies in an airtight container at room temperature for up to three days to maintain the fudgy texture and soft frosting. For longer storage, refrigeration helps preserve all layers, though bring them to room temperature before serving to enjoy the full flavors.

Freezing

These brownies freeze beautifully. Wrap individual bars tightly in plastic wrap and place in a freezer-safe bag or container for up to three months. Thaw overnight in the fridge and bring to room temperature before enjoying—the layers will still taste fresh and just as indulgent.

Reheating

To revive the rich texture and flavors after freezing, let the brownies come to room temperature first. If desired, warm them gently in a microwave for 10–15 seconds to soften the frosting and chocolate glaze slightly. Avoid overheating to prevent melting the layers unevenly.

FAQs

Can I substitute the hazelnuts with another nut?

Absolutely! While hazelnuts give these brownies their signature flavor, walnuts or pecans can be a great alternative if you prefer or have allergies. Just keep in mind the taste will shift slightly, but the texture and crunch will remain wonderful.

Is the Frangelico essential in the recipe?

Frangelico adds a lovely hazelnut liqueur note that complements the brownies perfectly, but if you prefer, you can substitute Kahlua or simply omit the liqueur. The brownies will still be delicious—just missing that extra depth.

Can I make these brownies gluten free?

Yes! Swap the all-purpose flour for your favorite gluten-free baking blend, making sure it has xanthan gum or a binding agent. The texture might be slightly different but still enjoyable and fudgy.

What is the best way to chop the hazelnuts?

Finely chopping the roasted hazelnuts by hand or pulsing briefly in a food processor works best. You want small pieces to distribute flavor and crunch evenly without overpowering the texture of each layer.

How do I know when the brownies are perfectly baked?

Look for a slightly firm top and edges pulling away from the pan. A tester inserted into the center should come out mostly clean with a few moist crumbs to ensure fudgy consistency without overbaking.

Final Thoughts

If you love the idea of a rich, nutty, and beautifully layered chocolate treat, the Triple Decker Hazelnut Brownies will quickly become a go-to recipe in your collection. From the satisfying crunch of the crust to the fudgy brownie and sweet frosting topped with smooth glaze, every bite is a celebration. I promise once you make these, you’ll be thrilled to share them with friends or save them for a special moment just for yourself. Go ahead, give this recipe a try, and enjoy the magic of triple-decker goodness!