Preheat the oven to 350 degrees F.
Add cake mix, eggs, and oil into a large bowl. Mix well with a large wooden spoon until all ingredients are combined, and then add chocolate chips and walnuts and mix.
Scoop dough using a large cookie scoop, and place onto the parchment lined baking sheet, 2 inches apart.
Bake for 7-10 minutes until golden brown with nice crisp edges. Adjust the baking time for thick cookies or crunchy cookies, or for soft cookies and chewy cookies.
Remove from the oven and transfer cookies to a wire rack to cool.
Serve and enjoy.