McDonald's Tests Hershey's Mix McFlurry

SAN FRANCISCO – FEBRUARY 09: A sign stands outside of a McDonald’s restaurant February 9, 2009 in San Francisco, California. Fast food chain restaurant McDonald’s reported a 7.1 percent increase in same store sales for January as people look towards cheaper food alternatives in the weakening economy. (Photo by Justin Sullivan/Getty Images)

McDonald’s is testing a new Hershey’s Mix McFlurry.

The Hershey’s Mix McFlurry features vanilla soft serve with a mix of Hershey’s signature candies swirled in.

The treat seems to be confined to select locations in California at this point. What flavor McFlurry should McDonald’s add next?