grasshopper brownies

INGREDIENTS

• 1 1/2 sticks (3/4 cup) unsalted butter
• 10 1/2 oz fine-quality bittersweet chocolate (not extra-bitter or unsweetened and no more than 60% cacao if marked), finely chopped
• 1 1/2 cups packed light brown sugar
• 3 large eggs, lightly beaten
• 1 1/4 teaspoons vanilla
• 3/4 cup all-purpose flour
• 1/4 cup plus 2 tablespoons unsweetened Dutch-process cocoa powder
• 3/4 teaspoon salt
• 1/2 cup heavy cream (see recipe notes)
• 10 oz fine-quality white chocolate, chopped (see recipe notes)
• 2 tablespoons green crème de menthe (I skipped this and found the mint flavor strong enough; compensated for the tinting with a single drop of green color)
• 1 teaspoon peppermint extract
• 1 cup heavy cream (see recipe notes)
• 10 oz fine-quality bittersweet chocolate (not unsweetened), finely chopped