Line 8x8 pan with foil and spray with non-stick spray.
Melt white chips and shortening by microwaving for 45 seconds, stirrinf and repeating unil melted and smooth.
Add sweetened condensed milk and mint to melted chocolate and stir to incorporate.
Add food coloring to reach desired color.
Allow mixture to cool a litlle before adding mini chips or they will melt.
Fold in mini chips, reserving about 1/4 to place on top.
Transfer to prepared pan and press into place.
Sprinkle top with reserved chips and refrigerate for at least 1 hour before cutting.