Preheat the oven to 350°F and line 2 large cookie sheets with parchment paper.
In a large bowl, add the cake mix, eggs, and oil. Stir until you can't see any more dry cake mix. Don't overmix.
Use a cookie scoop to scoop the dough onto the cookie sheets, about 2 inches apart. Don't flatten the dough balls.
Bake at 350°F for 10 to 12 minutes, until you see cracks on top of the cookies. Be careful not to overbake. Leave the cookies on the pan for 5 minutes, then move them to a cooling rack.
Notes
More spice: For spicier cookies, stir in 1 teaspoon of ground ginger. For a warmer spice, stir in 1 teaspoon of cinnamon.
Oil or butter: I always use oil. Butter is a 1:1 swap.
No chilling: The dough goes straight from the bowl to the oven.
Sandwich cookies: Let the cookies cool completely before filling. You'll need about 2 cups of filling.
Storage: Store cooled cookies in an airtight container at room temperature for up to 5 days. If you frosted them, separate the layers with wax or parchment paper.
Freezing: Bake the cookies as directed and freeze them already baked, in an airtight container, for up to 2 months. I don't freeze the dough because it comes together so quickly.