Combine cake mix and flour in a medium bowl, whisk {or sift} together. Add eggs, melted butter and sour cream. Mix using a hand held {or stand} mixer until you have a thick dough. Add white chocolate chips to cookie dough and mix until they are evenly distributed in the dough.
Using a 1/4 cup, measure out 11-12 cookies. Use your hands to press the cookie dough into a disc that is a thick round circle. Bake 6 cookies at a time. Place the cookie on a silicone mat {or parchment} lined baking sheet for 9-11 minutes or until set.
Remove cookies from the oven, add a few extra white chocolate chips to the top of each cookie and allow them to cool completely on the baking sheet.
Notes
* To make 18-20 smaller cookies, use a medium cookie scoop and bake cookies for 8-10 minutes. Follow all of the other steps as directed.