Line a tray with non stick paper and place 10 blobs of Nutella on the tray and place in the freezer for at least an hour.
Preheat the oven to 180°C (350°F) and line an 8"x8" pan with baking paper.
Melt the butter and white chocolate together.
Beat the egg, brown sugar, sugar and vanilla extract together until light.
Mix in the chocolate mixture.
Mix in the flour and baking soda.
Add the frozen Nutella blobs and pour into the pan.
Bake for 20-30 minutes. The outside edges will be golden, the middle will sink slightly and the top will be crackly. The middle will also wobble slightly but this is a good as it will be nice and fudgy!
Allow to cool to room temperature if you want to slice these otherwise you can devour with a spoon!
Store in an airtight container for up to a week at room temperature. Or store in the fridge for a more fudge like texture.
Video
Notes
If you want the blondie gooey, check it at 20 minutes and if the sides and top is crisp but the middle wobbly, take it out.
It's important to freeze the blobs of Nutella before dotting them around the brownies. If you don't freeze the Nutella, you run the risk of cooking it which will dry up the Nutella or make it spread throughout the white chocolate brownies.
Substitutions:
Gluten free flour - You can replace the all purpose flour in this recipe 1:1 with a gluten free flour mix made specifically for baked goods.
Buttery Spread - You can replace the butter in this recipe with a buttery spread. This may change the flavor slightly depending on the flavor of the buttery spread.