Fudgy Halloween Brownies with Hazelnuts and Chocolate Spiderwebs

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A white chocolate* spiderweb is all these fudgy hazelnut brownies need for Halloween. Finely ground whole hazelnuts* replace grain flour in a dense batter with dark chocolate and unsweetened cocoa powder*. Once the brownies are completely cool, each square gets a thin dark glaze and its own white web. The individual decorations make them easy to arrange on a party platter and serve without slicing at the table.

Why ground hazelnuts work in this brownie batter

Ground hazelnuts* bring nutty flavor and a fine texture to the chocolate batter, while eggs give it structure. Choose full-fat ground whole nuts rather than defatted hazelnut flour, which absorbs moisture differently. This recipe is designed for a dense, fudgy crumb, so it contains no baking powder and the eggs are mixed briefly rather than whipped into a large volume of foam.

Ingredients for fudgy chocolate-hazelnut brownies

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Ingredients for 16 brownies

Active preparation, including decorating: about 35 minutes · Baking: about 30 minutes · Cooling: about 90 minutes · Setting: about 30 minutes · Total: about 3 hours 5 minutes. Use a metal pan measuring about 20 × 20 cm (8-inch square) inside, parchment paper, two heatproof bowls, a whisk, spatula, a small piping bag with an approximately 1-mm opening or a folded parchment cone, and a toothpick for drawing. Cooling may take longer in a warm room. Weight measurements are the reference for this recipe.

• 200 g (7 oz) dark chocolate, about 70% cacao, for the batter
• 150 g (5.3 oz; about 10 1/2 tablespoons) unsalted butter for the batter
• 150 g (about 3/4 cup) granulated sugar*
• 3 large eggs, about 150 g without shells
• 120 g (4.2 oz) finely ground hazelnuts*, made from full-fat whole nuts, not defatted flour
• 25 g (0.9 oz) unsweetened cocoa powder*
• 2 g fine salt*
• 100 g (3.5 oz) dark chocolate, about 70% cacao, for the glaze
• 15 g (about 1 tablespoon) unsalted butter for the glaze
• 60 g (2.1 oz) white chocolate* containing cocoa butter, for the webs

For the webs and finishing touches

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How to make the brownies

1. Heat the oven to 175°C / 350°F conventional, or 160°C / 320°F fan. Line the 20 × 20 cm (8-inch square) metal pan completely with parchment, leaving overhang on two sides for lifting. Weigh the batter and glaze ingredients separately.
2. For the batter, chop 200 g dark chocolate and melt it with 150 g butter in a heatproof bowl over hot, gently steaming water. The bowl must not touch the water; keep water out of the chocolate. Stir smooth, remove from the heat and cool for about 5 minutes until lukewarm.
3. Whisk the eggs, granulated sugar* and 2 g fine salt* together for about 1 minute, just until combined rather than thick and foamy. Stir in the lukewarm chocolate-butter mixture. Mix the ground hazelnuts* with sifted cocoa powder*, then fold them into the batter just until no dry patches remain. Do not taste the raw batter.
4. Spread the batter evenly in the pan and bake on the middle rack for about 28–32 minutes. Start checking at 26 minutes: the edges should be set and the middle should no longer wobble like liquid when the pan is gently moved. A skewer should carry moist crumbs, not liquid egg batter. Bake a little longer if necessary; waiting for a completely dry skewer can dry out these brownies.
5. Leave the brownie slab in its pan for about 15 minutes, then carefully lift it onto a rack using the parchment. Cool completely for about another 75 minutes. Cut into 16 squares with a sharp knife, wiping the blade between cuts. If the cooled slab is still too soft to slice neatly, briefly refrigerate it before cutting.
6. For the dark glaze, gently melt 100 g dark chocolate with 15 g butter over the water bath and stir smooth. Melt the white chocolate* separately just until fluid, keeping it dry, then transfer to the small piping bag. Both chocolates should flow easily but should not be hot.
7. Decorate one brownie at a time: spread a thin layer of dark glaze over a square. Immediately pipe a small white chocolate* dot in the center and three thin concentric rings around it. Drag a toothpick from the center outward through the soft rings at eight evenly spaced points. Wipe the tip after each stroke and start again at the center to create the spiderweb. Only then glaze and decorate the next brownie.
8. Let the chocolate set in a cool place for about 30 minutes, or longer if needed. Remove every toothpick used for decorating before arranging the brownies on a serving platter. If refrigerated, let the squares stand briefly before eating for a softer chocolate texture.

The secret to clear white chocolate webs

Both chocolates must still be soft when you draw the pattern, so do not glaze the whole batch first. Use a light touch and skim the surface instead of digging into the brownie. If the white lines spread too much, let the chocolate cool slightly; if it thickens in the bag, gently warm the bag with your hands. Practice one web on parchment to check the piping opening. A little handmade variation is part of the look.

Fudgy should not mean raw

The middle must be set when the brownies leave the oven. Their moist texture comes from chocolate, butter and ground hazelnuts*, not liquid egg batter. They firm up as they cool completely. A larger pan makes thinner brownies and changes the baking time; use the specified pan for the timing given here.

How to grind whole hazelnuts

If you have whole hazelnuts*, grind 120 g into a fine meal. Use short pulses in a food processor, pausing between pulses and stopping before oil is released or the nuts turn into paste. Start with cool nuts. Defatted hazelnut flour and sweetened hazelnut spread change the batter's composition and are not direct substitutes.

Plan ahead for the party

Bake the slab the day before, cool completely and wrap airtight. Slice and decorate on the day of the party. Store finished brownies in a closed container in a cool place, separated with parchment, and enjoy within about three days. Refrigerate in warm weather and let them stand briefly before serving. Keep the chocolate glaze out of direct sunlight.

Made without grain flour, with an important ingredient check

There is no grain flour in this batter. For guests with celiac disease, check the ground hazelnuts*, cocoa powder* and both chocolates for suitability and prevent cross-contact during preparation. These brownies contain hazelnuts*, eggs and milk ingredients; chocolate may also contain soy. Check the labels and clearly identify the nuts on the party table.

Estimated nutrition per brownie

Per one of 16 brownies, including the dark glaze and white chocolate* web: approximately 303 calories, 18 g carbohydrate, 4.6 g protein and 23 g fat. Calculated from the listed quantities; chocolate brands, nut composition and the amount of glaze on each square change the estimate. Carbohydrate uses the European labeling basis for the plant ingredients.

Contains hazelnuts, eggs and milk; depending on the chocolate, soy may also be present. Do not taste raw batter containing egg. Remove decorating tools before serving.

Recipe by AI_Chef