Preheat the oven to 350 degrees and line a large baking sheet with parchment paper.
Pour the colored sugars onto a plate. You can place them all on one plate, just keep them slightly separated.
Combine the cake mix, eggs, oil and flour in a large bowl. Mix well.
Scoop the cookie dough into 2″ balls using a cookie scoop or a regular large spoon.
Dip each cookie ball into the colored sugar. You can either make them a solid color or turn each ball slightly and dip in the next color for the rainbow effect!
Place the cookie dough balls 2-3 inches apart on the baking sheet and bake for 8-10 minutes.
Remove from the oven and let cool 5-6 minutes.
Place one Hershey’s Birthday Kiss in the center of each Unicorn cookie.