Atomic Brownies from Brownies To Die For! by Bev Shaffer

Ingredients

• 5 large eggs, lightly beaten
• ⅔ cup granulated sugar
• 1 tsp. milk, whole or 2 percent
• 2 tsp. pure vanilla extract
• 2 tsp. instant espresso powder
• 1½ cups unbleached, all-purpose flour
• 1¼ cups coarsely chopped walnuts, toasted
• ¼ tsp. salt
• 1 cup unsalted butter
• 4 oz. unsweetened chocolate, coarsely chopped
• 14 oz. semisweet chocolate, coarsely chopped
• ½ cup firmly packed light brown sugar
• ½ cup firmly packed dark brown sugar
• ⅓ cup heavy (whipping) cream
• 3 oz. bittersweet chocolate, finely chopped
• 2 oz. semisweet chocolate, finely chopped