01 -
In a large bowl, combine the softened butter with granulated sugar and beat with a hand mixer or wooden spoon until the mixture becomes light and fluffy.
02 -
Add the egg to the creamed mixture and mix thoroughly until fully blended.
03 -
Gradually add the all-purpose flour, mixing until just combined and a soft dough forms.
04 -
Gently fold in the chocolate chunks and, if using, the chopped walnuts until evenly distributed throughout the dough.
05 -
Roll portions of dough into walnut-sized balls by hand. Arrange them on a parchment-lined baking sheet, leaving space between each ball for expansion during baking.
06 -
Preheat the oven to 350°F (180°C). Bake the dough balls for 12 to 15 minutes, or until the exterior turns golden brown.
07 -
Allow the cookie dough balls to cool briefly on a wire rack before serving.