Grease and line a 20cm square cake/slice tin with baking paper.
Place the dark chocolate and chopped butter into a microwave-safe bowl.
Heat on 50% power for 3 minutes (or until just melted) in 30 second bursts, stirring at each interval with a dry metal spoon.
When the butter and the chocolate have melted, add the Nutella, brown sugar, vanilla extract, 2 whole eggs and 1 extra yolk and mix together well with a spoon until completely combined.
Gently stir through the plain flour until just combined (being careful not to over-mix).
Pour the brownie batter into the prepared tin and bake for 25-30 minutes.
Remove the brownie from the oven and set aside to cool in the pan.
Place the cooled brownie into the fridge for 2-3 hours. Cut into pieces and serve.
Thermomix Method
Preheat oven to 175 degrees celsius (fan-forced). Grease and line a 20cm square cake/slice tin with baking paper.
Place the chocolate and butter into the Thermomix bowl and melt on 100 degrees, Speed 2 for 3 minutes. Scrape down the sides of the bowl.
Add the Nutella and mix together on 100 degrees, Speed 2 for 30 seconds.
Add the brown sugar and mix together on Speed 4 for 10 seconds. Scrape down the sides and mix for a further 10 seconds on Speed 4.
Add the vanilla extract, 2 whole eggs and 1 extra yolk and mix together on Speed 4 for 20 seconds.
Add the plain flour and mix together on Speed 4 for 10 seconds. Scrape down the sides of the bowl and mix for a further 10 seconds.
Pour the brownie batter into the prepared tin and bake for 25-30 minutes.
Remove the brownie from the oven and set aside to cool in the pan.
Place the cooled brownie into the fridge for 2-3 hours. Cut into pieces and serve.
Notes
RECIPE NOTES & TIPSTips for making gooey brownies:
Nutella is the key to making these brownies incredibly fudgy and gooey… and just wait til the next day (they’re even more DELICIOUS!)
adding the extra egg yolk gives the brownies a thick dense texture
cooking the brownies until the top is flakey and the base is still moist and fudgy is key! Don’t overcook the brownies! Test them by inserting a skewer into the middle, it should come out with a thick smear of brownie on it (but not runny).
Storing - Brownies can be stored in an airtight container at room temperature for up to 4 days.Freezing - Freeze brownies in an airtight container for up to 3 months. Allow to come to room temperature before serving.Serving - You can serve brownies on their own or with berries, whipped cream, custard, ice-cream, grated chocolate or berry coulis.