350gNutella, separated300g for brownie batter, 50g for Nutella swirl on top
Preheat your oven to 170°C/150°C fan. Grease a 12″ x 9″ traybake tin with butter or non-stick spray and line with foil/baking/parchment paper. If using foil, spray it again with non-stick spray once lined. Leaving some overhang of foil/baking paper makes it easier to lift the brownies out to slice later.
To a small/medium bowl add the flour and salt. Whisk to combine and set aside.
To your large bowl add the caster sugar.
Next add the melted butter to the caster sugar and whisk to combine.
Add the eggs, one at a time to the large bowl, whisking until combined after each addition.
Warm 300g of Nutella briefly in the microwave (20-30 seconds) and then add it to the large mixing bowl, whisking until combined (warming it makes it easier to mix together with the other ingredients).
Now add the dry ingredients to the large bowl. Using your whisk, spatula or wooden spoon, gently mix the dry ingredients into the batter, until no pockets of flour remain. It will feel quite thick to start but the more you mix it the smoother it will become.
Pour the brownie batter into your prepared traybake tin. The mixture is quite thin so you can tilt the tin to spread the mixture into the corners, making sure it is level.
Warm up the remaining 50g of Nutella in the microwave, again for around 30 seconds until it's less thick and more pourable. Using a spoon, drizzle the warmed Nutella on top of the brownie mixture, in different directions to cover the whole area.
You could leave it with the drizzle pattern, or you could do as I have done and swirl it horizontally and vertically with a butter knife to create this pattern. It looks quite subtle here but as it bakes the pattern will become more prominant, thanks to the pockets of Nutella you've swirled through!
Place the traybake tin in your preheated oven for around 25 minutes. You will know it is baked when a skewer inserted into the centre comes out almost clean with a few moist crumbs (but no wet cake mixture).
Leave the tray to cool completely on a wire rack. Try to resist the urge to cut the brownies before they're cooled or they won't hold their shape well.
Brownies keep well for up to a week, but they're at their best within the first 3-4 days. Store in an airtight container at room temperature.
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