Preheat oven to 350 degrees F. Spray a cookie sheet with non-stick spray.
Measure out 1/3 cup of coconut oil and stick it in the microwave for about 20 seconds to melt it. {It mixes better this way.}
Combine cake mix and eggs in a medium mixing bowl. Add melted coconut oil. Mix well. Mixture will be thick, so I used a Kitchenaid to mix it.
Add in chocolate chips and walnuts and stir to combine. {My Kitchenaid was useless for this part, so I hand-stirred the chocolate chips and walnuts in.} Cookie dough will be firm- see picture below.
Use a small cookie scoop to measure out dough and place on the cookie sheet. Bake for 8-10 minutes. Once they're done, remove from oven and let them rest for another 3-5 minutes on the hot cookie sheet. Transfer to baking racks to cool completely.