When I originally posted this recipe in 2013, cake mix was approximately 18.25 ounces per box and now box sizes have dropped to about 15.25 ounces. Use the largest sized box of red velvet cake mix you can find.
Cookies will keep airtight at room temperature for up to 1 week or in the freezer for up to 6 months.
Alternatively, unbaked cookie dough can be stored in an airtight container in the refrigerator for up to 5 days or in the freezer for 4 months, so consider baking only as many cookies as desired and save the remaining dough to be baked in the future when desired.
Recipe adapted from Duncan Hines.