This article has been corrected to reflect that on April 26, Milkshake Factory will host a Buy One, Get One promotion on all ...

P’unk Burger on East Passyunk will once again support the Girl Scouts of Eastern Pennsylvania with a full menu of hand-dipped milkshakes featuring a few different flavors of the famous cookies.

Celebrity chefs like Sunny Anderson, Duff Goldman, Bobby Flay, and Trisha Yearwood all have their own takes on a classic chocolate milkshake. I tested all four of their recipes to find the best one.