Easy Fudgy Nutella Blondies

Deliciously fudgy blondies with a glossy Nutella swirl, perfect for dessert lovers.

Scale

240 g (2 cups) all-purpose flour
170 g (3/4 cup / 6 tablespoons) unsalted butter, melted
220 g (1 cup, packed) light brown sugar
50 g (1/4 cup) granulated sugar
1 large egg (about 50 g)
5 ml (1 teaspoon) vanilla extract
2 g (1/2 teaspoon) baking powder
3 g (1/2 teaspoon fine salt)
200 g (about 3/4 cup + 2 tablespoons) Nutella
Optional: 100 g (1 cup) chocolate chips or 60 g (1/2 cup) chopped toasted hazelnuts

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Preheat the oven to 175°C (350°F). Line a 23 cm (9 x 9 inch) pan with parchment, leaving a 2–3 cm (1 inch) overhang.
Melt the butter and combine with sugars until glossy and dissolved. Let cool.
Whisk in the egg and vanilla until smooth.
Fold in the dry ingredients until just combined.
Add chocolate chips or hazelnuts if using.
Spread batter in the prepared pan, dollop with Nutella, and swirl gently.
Bake for 22–28 minutes until edges are set; the center should look fudgy.
Cool on a wire rack, then lift out using parchment overhang and slice once slightly cooled.

Serve warm for best texture. Store wrapped at room temperature for up to 4 days.