Chocolate Walnut Cookies

Description
The cookies will be very soft. Transfer the baking sheets to racks and let the cookies cool completely before removing them from the sheets. The cookies will firm up as they cool.
 * Makes about 12 cookies.

Ingredients

 * 4 large eggs
 * 1½ cup sugar
 * 16 oz semisweet chocolate melted and cooled
 * ¼ cup unsalted butter, softened
 * 1 tbsp vanilla
 * 1 tbsp strong brewed espresso
 * ½ cup cake flour
 * ¼ tsp salt
 * 1 tbsp double-acting baking powder
 * 2½ cup semisweet chocolate chips
 * 1 cup walnuts, chopped

Directions

 * 1) In the bowl of an electric mixer beat the eggs and the sugar for 4 to 6 minutes, or until the mixture is thick and pale, add melted chocolate, the butter, the vanilla, the espresso, the flour, the salt and the baking powder, and beat the mixture on the lowest setting until it is combined well.
 * 2) Add the chocolate chips and the walnuts and beat the dough until it is combined well.
 * 3) In a sheet of parchment paper, form the dough into a log, 4 inches in diameter, wrap it in wax paper, and chill it for 3 hours, or until it is firm.
 * 4) Cut the log into 1-inch-thick rounds, arrange the rounds 2 inches apart on baking sheets lined with parchment paper, and bake them in batches in the middle of a preheated 350°F oven for 15 minutes, or until the tops are shiny and cracked slightly.