INGREDIENTS
12 tbsp
butter, cut into pieces, plus 1 teaspoon melted butter for brushing pan
1/2 cup
all-purpose flour
1/8 tsp
salt
6 oz
bittersweet chocolate, in pieces
3
eggs
1 cup
sugar
1/2 tsp
vanilla extract
2/3 cup
lightly toasted walnuts or hazelnuts (optional)