1. Preheat the oven to 180°C.
2. Melt together the Nutella and the butter in the bathtub until the mixture is very smooth.
3. Gradually add the sugar, eggs, salt and sifted flour to the melted mixture. Add the chemical yeast and mix until you achieve a homogeneous batter.
4. Pour batter into buttered mold, then bake for about 20 minutes.
5. Let cool slightly before tasting. For an extra treat, you can spread an extra layer of Nutella on the brownies.