In the bowl of an electric mixer, beat cream cheese on medium-high until smooth. Add shortening and beat until creamy.
Add sugars, beating until combined and smooth.
Starting with 1/4 cup flour, beat on medium-low and then add the rest of the flour in two batches, scraping down sides of bowl in between.
Stir in mint chocolate chips.
Drop the dough by tablespoonfuls onto an ungreased or parchment paper-lined cookie sheet, about 2 inches apart. Press down slightly with the back of a spoon or your fingers. The cookies don’t spread as they bake so they are about the size that you place them on the pan.
Bake 12-14 minutes or until just barely browned. Don’t over bake. You want them to be soft.
Cool 10 minutes on pan and then transfer to a cooling rack. Store in airtight container at room temperature.