To make the cake mix you will need
Preheat oven to 350 F. Use cupcake liners for regular sized cupcakes. Prepare the cake mix as indicated on the box. Only fill the cupcakes to about 2/3 full. Place a mint in the middle of each cup then spoon a little more batter over the mint.
Bake for approximately 20 minutes. Test by pressing down lightly on the cupcake top. If it springs back up it is done. The toothpick test won’t work because the center is gooey from the melted mint. Cool the cupcakes completely before icing.
For the frosting, you can use as is and sprinkle with green colored sugar. Or mix green food coloring and a drop of peppermint extract to taste. Ice the cupcakes when they are cool. Cut the remaining mints in half and garnish the top of the cupcake with the mint.