This recipe is my go-to when I need a quick, comforting tray of something chocolatey that everyone will devour. I discovered these Nutella brownies on an evening when I had a jar of Nutella and a craving for something rich but fuss-free. The batter comes together in one bowl, the texture is deeply fudgy, and the hazelnut chocolate note from the Nutella shines through every bite. I remember bringing a pan to a potluck and watching the plate empty in record time; that immediate, unanimous approval sealed this recipe into my regular rotation. The brownies balance dense, almost ganache-like crumb with a shiny Nutella swirl on top. They are not cakey or crumbly; instead they have a moist, chewy interior that holds together but melts on the tongue. The combination of melted dark chocolate and Nutella gives a layered chocolate profile: bitter cocoa notes from the dark chocolate, sweet, creamy hazelnut from the spread, and a tender butter base that keeps them luxuriously soft. I often make them for weekend coffee dates with friends and for birthdays when someone specifically requests a chocolate-hazelnut treat.

Ingredients

• Unsalted butter: 1/2 cup. Use good-quality European-style butter if you want a slightly creamier mouthfeel; it gives richness and helps the texture stay moist.
• Dark chocolate: 3 ounces finely chopped or 1/2 cup chocolate chips. I use 50 percent cacao for balanced bitterness; 60 to 70 percent works if you prefer deeper chocolate notes.
• Granulated sugar: 2/3 cup. This amount keeps the brownies sweet but not cloying, letting the chocolate and hazelnut flavor come through.
• Vanilla extract: 2 teaspoons. Pure vanilla smooths the chocolate flavor and complements the Nutella.
• Large eggs: 2 whole eggs (2 large eggs plus 1 extra yolk). Room temperature eggs incorporate better and yield a silkier batter.
• Nutella: 1 1/4 cups total. Use 3/4 cup in the batter and reserve 1/2 cup to drop and swirl on top. A standard 13-ounce jar covers both quantities easily.
• All-purpose flour: 1 cup. Spoon and level for accuracy to keep the brownies fudgy rather than cakey.
• Salt: 1/4 teaspoon. A small amount of salt brightens the chocolate flavor and balances sweetness.

Instructions

Preheat and prepare the pan: Preheat the oven to 350F. Line an 8x8 inch pan with parchment paper or aluminum foil with an overhang to lift the brownies out later. A 9x9 inch pan can be used but expect thinner bars and slightly reduced bake time. Melt chocolate and butter: In a large microwave-safe bowl, combine the butter and chopped dark chocolate. Microwave in 45-second intervals on medium power, stirring between intervals, until smooth. Alternatively, use a double boiler over gently simmering water. Remove from heat and let cool briefly so the mixture is warm but not hot. Incorporate sugar and Nutella: Whisk the granulated sugar into the melted chocolate mixture until glossy. For easier mixing, warm the Nutella in the microwave for 30 to 60 seconds until pourable, then whisk 3/4 cup into the chocolate and butter until fully combined and smooth. Add eggs and flavoring: In a small bowl whisk the two whole eggs and the extra yolk together with the vanilla. Whisk the eggs into the chocolate mixture quickly but steadily; the residual heat will gently combine them and create a shiny batter. If the bowl is too hot, let the chocolate cool another minute to avoid scrambling. Fold in dry ingredients: Using a rubber spatula, fold in the flour and salt until just combined. Do not overmix. The batter should be thick and glossy. You will see streaks of Nutella and chocolate, which contribute to a fudgy finished texture. Transfer and swirl: Pour the batter into the prepared pan and smooth the top. Drop spoonfuls of the reserved 1/2 cup Nutella evenly across the surface, about 1 to 2 teaspoons per spoonful. Use a wooden skewer or toothpick to gently swirl the Nutella into the batter in a decorative pattern. Aim for contrast but avoid over-swiring, which will flatten the texture. Bake and cool: Bake in the middle of the preheated oven for 30 to 35 minutes for an 8x8 inch pan. If using a 9x9 inch pan, start checking at 22 minutes and expect 22 to 27 minutes total. The center should still look slightly soft and glossy; a toothpick inserted in the center will come out with moist crumbs rather than clean. Cool completely in the pan before lifting out on the parchment and slicing. Wipe your knife between cuts for clean edges.

Storage Tips

Store fully cooled bars at room temperature in an airtight container for up to four days. If your kitchen is warm, refrigerate to prevent the Nutella swirls from becoming too soft; bring back to room temperature before serving for the best texture. For longer storage, wrap individual squares tightly in plastic wrap and place in a freezer-safe bag for up to three months. Thaw overnight in the refrigerator or at room temperature for a few hours, then let sit at room temperature before serving to revive the fudgy crumb.

Ingredient Substitutions

If you do not have Nutella, use another commercial chocolate-hazelnut spread to maintain texture and stability. Homemade spreads can separate and produce inconsistent swirls, so stick with store-bought if possible. For dairy-free versions, choose a dairy-free chocolate and a lactose-free hazelnut spread labeled vegan; expect a slightly different mouthfeel. To reduce sugar, substitute half the granulated sugar with coconut sugar, noting that color and flavor will deepen. For gluten-free, use a 1-to-1 gluten-free flour blend and proceed the same way; the texture will remain fudgy though slightly more tender.

Serving Suggestions

Serve warm squares with a scoop of plain vanilla ice cream or a dollop of lightly whipped cream to contrast the dense chocolate. A sprinkle of flaky sea salt right before serving elevates the chocolate and hazelnut notes. For a brunch twist, pair slices with espresso or a milky latte. Garnish with toasted hazelnut halves or cocoa nibs for texture. These bars also make an attractive dessert on a platter with fresh berries to cut through the richness.

Cultural Background

Nutella itself is an Italian-inspired chocolate-hazelnut spread that became popular worldwide in the mid 20th century. The concept of combining chocolate with hazelnut pastes or spreads has roots in European confections and pralines. These brownies represent a modern, simple fusion: an American-style dense chocolate bar enriched by the signature flavor of a globally recognized spread. Over time, cooks have adopted Nutella as an easy flavor shortcut in many bakes, from cookies to tarts, because it brings both sweetness and a nutty profile in one jar.

Seasonal Adaptations

In cooler months, serve warm squares with a sprinkle of ground cinnamon or a chile-spiced sugar to add warmth and complexity. For spring and summer, top chilled squares with fresh raspberries for a bright contrast. During the holidays, fold in 1/3 cup chopped toasted hazelnuts into the batter for crunch and a festive finish. For a lighter seasonal version, reduce the Nutella swirl slightly and pair the bars with a citrusy sauce or compote to balance the richness.

Meal Prep Tips

These brownies are ideal for make-ahead snacks. Bake and cool fully, then cut and store squares layered between parchment in an airtight container. For grab-and-go treats, portion squares into small containers or wrap individually. If freezing, thaw wrapped squares in the refrigerator overnight and bring to room temperature before serving. When preparing for large events, double the recipe and bake in two pans so you have a steady supply without overbaking any single batch.

These brownies are a simple way to bring warm, comforting flavor to any table. The combination of melted chocolate, butter, and Nutella delivers a reliably decadent result that is both elegant and everyday friendly. I hope you keep a jar of Nutella on hand after making these — you will find many excuses to bake them again.