In a heavy saucepan melt the chocolate and butter together over low heat. Stir frequently to prevent the chocolate from burning at the bottom. Set aside and cool
Using the paddle attachment of your mixer, mix the eggs and sugar on high speed for 5-7 minutes or until the mixture becomes pale and thick
Slowly add the flour, salt, and vanilla. Keep mixing. Remember to scrape the bottom of the bowl with a spatula
Finally add the cooled chocolate mixture slowly.
Pour batter into the prepared cake pan
Bake for 38-45 minutes or until there's a slight wobble in the middle of the cake. Mine took 40 minutes
Remove from oven and cool in pan for 10 minutes. Cake will deflate slightly
Turn the cake into a cake plate. If desired, sprinkle some dusting sugar on top and serve
Enjoy!
Notes
You can substitute both chocolates for 400 grams of semi-sweet chocolate chips