I make these all the time - sometimes I also sprinkle the frosting with yellow sugar. But today I was running out of time.
Using your favorite sugar cookie mix - roll out the dough and cut out some 2-inch circles.
Then I frosted the cookies with melted white chocolate tinted with yellow gel food coloring. Once the yellow chocolate has set add the white line with some melted white chocolate in a zipper top bag with a small corner sniped off.
Once the chocolate has dried on the tennis balls - they can be placed on a serving platter.
Here is my serving platter - I placed them on a large white oval platter.