1 block good-quality dark chocolate
¾ cup unsalted butter
1 ½ cups sugar
2 teaspoons vanilla
4 large eggs
1 teaspoon salt
1 cup plain flour
1 cup dark chocolate chips
1. Preheat the oven to 180° C.
2. In a bowl set over a pan of barely simmering water, melt the dark chocolate with the butter, stirring until the mixture is smooth. Make sure the bowl fits tightly over the saucepan so that no steam gets into the chocolate/butter mixture.
3. Remove the bowl from the heat and let the mixture cool until it is lukewarm.
4. Stir in the sugar and the vanilla and add the eggs one at a time, stirring well after each addition.
5. Add the salt and the flour, stirring until the mixture is just combined and then add in the chocolate chips.
6. Pour the batter into a well-buttered and floured baking pan and spread evenly.
7. Bake the mixture in the middle of the oven for 25–30 minutes or until a skewer comes out with crumbs (not goo) on it.
8. Let the mixture cool completely in the pan on a rack and cut it into bars.