In small microwavable bowl, microwave chocolate chips and 1 tablespoon of the shortening uncovered on High 1 to 2 minutes, stirring every 30 seconds, until softened and chips can be stirred smooth. Insert 1 lollipop stick halfway into each marshmallow. Dip marshmallow in chocolate, tapping off excess. Poke opposite end of stick into foam block. Refrigerate 15 minutes or until set.