Beat 2 sticks butter, 3/4 cup dark brown sugar and 3/4 cup granulated sugar until fluffy; beat in 1 teaspoon vanilla and 3 egg yolks. Whisk 2 1/2 cups flour, 3/4 teaspoon baking soda and 1 teaspoon salt, then stir into the butter mixture. Add 2 cups semisweet chocolate chunks and chill 30 minutes. Roll into 1-inch balls and chill 1 hour. Bake 15 to 20 minutes at 350 degrees.
Recipe courtesy Food Network Magazine