For the brownie:
150 gr flour
225 gr sugar
225 gr butter
300 gr dark chocolate
150 gr crushed walnuts (or hazelnuts, almonds or your favorite nuts)
1 vanilla powder extract
You'll need to crush the chocolate in small pieces so it melts easily. Put the butter and the chocolate pieces in a bain marie (I use 2 IKEA pots in different sizes, placing the smaller one inside/on top of the big one). Stir with an egg whisk while the chocolate melts and pour the sugar, continue to stir until it dissolves in the chocolate. Put in the mix the eggs, one at a time, the vanilla and the crushed walnuts as well. Also put in the flour and after you've mixed all the ingredients well empty the mix in a baking dish (I use a round form with a 25 cm diameter).
Place it in the oven for 25-30 minutes at 170 °C so it remains moist in the center, if you want it to be more like a cake bake it for 40 minutes. Leave it to cool off before you cut it into pieces.
For the chocolate sauce:
150 gr milk
Place the milk and nutella into a pot, over a medium temperature and stir them occasionally until they mix completely. You can keep the sauce at room temperature, if you put it in the refrigerator just warm it in a bain marie to serve it warm.
To serve it:
Cut a piece of the brownie, place scoops of vanilla ice cream on top and at it's sides and pour generous amounts of warm chocolate sauce. Enjoy!