1 pound ·
(4 sticks) unsalted butter
1 pound ·
bittersweet or semisweet chocolate, cut into 1/4-inch pieces
8 large ·
eggs
½ teaspoon ·
salt
2 cup ·
granulated sugar
2 cup ·
dark brown sugar, firmly packed
1 tablespoon ·
vanilla extract
2 cup ·
all-purpose flour