Preheat the oven to 350 degrees F. Line a baking sheet with parchment paper.
Add cake mix, eggs, and oil into a large bowl. Mix well with a large spoon until all ingredients are combined.
Add chocolate chips and walnuts. Mix with a large spoon.
Scoop dough using a cookie scoop, and place onto the parchment lined baking sheet, 2 inches apart.
Bake for 7-10 minutes.
Remove from the oven and transfer cookies to a wire rack to cool.
Notes
Add Different Chips: Such as, white chocolate or peanut butter chips, chocolate chunks or semi sweet chocolate chips, or even add extra chocolate chips.
Short cut tip: Freeze the cookie dough balls on a tray and then put them in the freezer so you can have fresh baked cookies any time.
Variation tip: Ice your cookies or try a chocolate drizzle for these Double Chocolate Chip Walnut Cookies.
Alternate ingredient: Try adding some candy coated chocolates or sprinkles to your cookies.
Alternate cooking method tip: Air fryer cookies are awesome, try making this chocolate cookie in the air fryer.
Dietary consideration tip: Omit the nuts if you know people who might be allergic.