Fudgy Dark Chocolate Walnut Brownies

Why You’ll Love This Recipe

• Intensely chocolatey and ultra-fudgy, with a shiny, crackly top like your favorite bakery brownie.
• Loaded with melty dark chocolate chunks and crunchy toasted walnuts in every bite.
• Simple, one-pan batter using everyday ingredients, with easy tips for perfect texture.
• Delicious served warm with a light cocoa dusting, or dressed up with ice cream for guests.

Grocery List

• Produce: None (just pantry and dairy).
• Dairy: Unsalted butter, eggs.
• Pantry: Dark chocolate bars or chips, granulated sugar, light brown sugar, all-purpose flour, unsweetened cocoa powder, instant espresso powder (optional), walnuts, vanilla extract, fine sea salt, unsweetened cocoa powder for dusting.

Full Ingredients

Fudgy Chocolate Walnut Brownies

• 170 g (3/4 cup / 1 1/2 sticks) unsalted butter, cut into pieces, plus extra for greasing the pan (if not using parchment)
• 200 g (7 oz) dark chocolate (60–70% cocoa), chopped
• 250 g (1 1/4 cups) granulated sugar
• 50 g (1/4 cup) light brown sugar, packed
• 3 large eggs, at room temperature
• 2 tsp pure vanilla extract
• 95 g (3/4 cup) all-purpose flour, spooned and leveled
• 30 g (1/4 cup) unsweetened cocoa powder (natural or Dutch-process), sifted if lumpy
• 1/2 tsp fine sea salt (or 1/4 tsp table salt)
• 1 tsp instant espresso powder (optional, boosts chocolate flavor without tasting like coffee)
• 100 g (1 cup) walnut halves or pieces, lightly packed
• 100 g (3.5 oz, about 2/3–3/4 cup) dark chocolate chunks or chips (60–70% cocoa)

For Serving

• Unsweetened cocoa powder, for dusting
• Optional: Vanilla ice cream or lightly sweetened whipped cream
• Optional: A pinch of flaky sea salt on top of each brownie

Step-by-Step Instructions

Step 1: Prep your pan, oven, and walnuts

Preheat your oven to 350°F (175°C). Line an 8-inch (20 cm) square metal baking pan with parchment paper, leaving some overhang on two sides to create a sling for easy removal. If you are not using parchment, lightly butter the pan and dust with cocoa powder, tapping out any excess.

Spread the walnut halves or pieces on a baking sheet in a single layer. Toast in the preheated oven for 6–8 minutes, stirring once halfway through, until fragrant and lightly golden. Let them cool slightly, then coarsely chop. Set aside to cool completely while you make the batter.

Step 2: Melt the butter and chocolate

Place the 170 g (3/4 cup) unsalted butter and 200 g (7 oz) chopped dark chocolate in a heatproof bowl. Melt together, either using short 20–30 second bursts in the microwave (stirring well after each burst) or over a saucepan of gently simmering water (double boiler method), stirring constantly until smooth.

Once fully melted and glossy, remove from heat and let the mixture cool for about 5 minutes. You want it warm but not hot, so it does not scramble the eggs when combined.

Step 3: Whisk eggs and sugar for a crackly top

In a large mixing bowl, combine the granulated sugar and light brown sugar. Add the eggs and vanilla extract. Whisk vigorously by hand for 2–3 minutes, until the mixture looks slightly thickened, pale, and glossy. This step helps create that classic shiny, crackly brownie top.

Slowly pour the slightly cooled melted chocolate-butter mixture into the egg-sugar mixture, whisking constantly until fully combined and smooth. Scrape down the sides and bottom of the bowl to make sure everything is evenly mixed.

Step 4: Combine the dry ingredients

In a separate medium bowl, whisk together the flour, cocoa powder, salt, and instant espresso powder (if using) until there are no visible streaks of cocoa or flour. This ensures the dry ingredients are evenly distributed and helps avoid overmixing later.

Tip the dry mixture into the wet mixture. Using a flexible spatula, gently fold the batter just until no dry patches remain. Work slowly and scrape the bottom of the bowl so all the flour is incorporated, but stop as soon as it looks evenly mixed—overmixing can lead to cakier brownies.

Step 5: Fold in walnuts and chocolate chunks

Add the chopped toasted walnuts and the dark chocolate chunks or chips to the batter. Fold them in gently until they are evenly dispersed throughout. The batter will be thick and glossy, with visible chunks of chocolate and nuts.

Scrape the batter into your prepared pan and spread it into an even layer, pushing it into the corners and smoothing the top with your spatula. For extra texture, you can sprinkle a few additional walnut pieces or chocolate chunks over the surface.

Step 6: Bake until fudgy and just set

Place the pan in the preheated oven and bake for 22–26 minutes. Start checking at 22 minutes, as oven temperatures vary. The edges should look set and slightly pulled away from the sides, while the center should still look soft and slightly underbaked.

Insert a toothpick into the center: for fudgy brownies, it should come out with a few moist, gooey crumbs clinging to it, but not wet batter. If it looks very wet, bake for another 2–3 minutes and check again. Avoid overbaking; the brownies continue to firm up as they cool.

Step 7: Cool, slice, and serve with cocoa dusting

Remove the pan from the oven and place it on a wire rack. Let the brownies cool in the pan for at least 20–30 minutes. For the neatest slices, allow them to cool closer to 1 hour, but for irresistibly gooey centers, serving them slightly warm is perfect.

Use the parchment sling to lift the brownies out onto a cutting board. Dust the top lightly and evenly with unsweetened cocoa powder using a fine-mesh sieve. Cut into 16 squares (4 by 4). For ultra-gooey brownies, wipe the knife with a warm, damp cloth between cuts.

Serve warm, optionally with a scoop of vanilla ice cream or a spoonful of whipped cream, and a tiny pinch of flaky sea salt on top of each brownie to sharpen the chocolate flavor.

Pro Tips

• Room-temperature eggs are key: Cold eggs can seize the melted chocolate. If needed, place whole eggs (in their shells) in a bowl of warm water for 5–10 minutes before using.
• Do not overbake: Pull the brownies when a toothpick shows moist, fudgy crumbs. Overbaking is the fastest way to lose that gooey center.
• Beat the eggs and sugar well: Whisking until thick and glossy helps create that distinctive shiny, crackly top.
• Use good-quality chocolate: Because chocolate is the star here, choose bars or chips you enjoy eating on their own, around 60–70% cocoa.
• Let them rest (a little): Even 20 minutes of cooling lets the brownies set just enough to slice while still staying lusciously gooey inside.

Variations

• Nut-Free Fudgy Brownies: Omit the walnuts entirely or replace them with the same volume of extra dark chocolate chunks. Add a pinch more salt (up to 3/4 tsp total) to balance the extra richness.
• Mocha Brownies: Increase the instant espresso powder to 2–3 tsp and drizzle the cooled brownies with a simple espresso glaze (powdered sugar plus strong coffee) instead of cocoa dusting.
• Salted Caramel Swirl: After spreading the batter in the pan, dollop 1/3–1/2 cup thick salted caramel sauce over the top and swirl it lightly with a knife. Bake as directed, then skip the cocoa dusting and finish with flaky sea salt.

Storage & Make-Ahead

Once completely cooled, store the brownies in an airtight container at room temperature for up to 3 days. Layer them with parchment or wax paper if stacking. For longer storage, wrap the whole uncut slab tightly in plastic wrap and then foil, or wrap individual brownies, and freeze for up to 2 months. Thaw at room temperature, or warm gently in a 300°F (150°C) oven for 5–8 minutes (or 10–15 seconds in the microwave) to bring back that just-baked gooey texture. You can also make the batter up to 1 day ahead: spread it in the pan, cover tightly, refrigerate, and bake straight from the fridge, adding 3–5 minutes to the baking time as needed.

Nutrition (per serving)

Approximate values per brownie (1 of 16): about 290 calories, 4 g protein, 32 g carbohydrates, 19 g fat, 8 g saturated fat, 2 g fiber, 24 g sugars, and 160 mg sodium. Values will vary based on the specific brands of chocolate, butter, and nuts you use, as well as portion size and optional toppings.