How do I get rid of smells and tastes leaching into other cookies when stored together for gifts? how to prevent cookies picking up the smell and taste of other cookies when storing together - Like Mint or Peanu Butter that makes all the other cookies taste like them.
The only way you're going to accomplish that is to (shrink)-wrap them individually or to put small hermetically sealed tin or plastic boxes inside a larger box...

Mint is just too powerful not to leach into everything and that's why the professionals:


shrink-wrap them individually or per type
sell a box per type ("Chocolate cookies", "fruit cookies" , ...)


Sorry: probably not what you wanted to hear...