Set mixer on LOW speed as you add the syrup mixture into the gelatin that has been resting on the bottom of the bowl.
Increase the speed to HIGH. Whip until the mixture becomes thick and fluffy. Depending on the mixer you use, it could take anywhere from 3-10 minutes.
Once the marshmallow mixture is fully whipped, add in the peppermint extract and peppermint crunch until combined and bits distributed throughout.
The mixture should be cool enough to touch, around 95°F.
Using a greased rubber spatula, spread mixture into a greased 13" x 9" x 2" pan. (I have used both glass and metal pans when making these.)
Here's the fun part! ( At least I think it is ! ) Wet you fingers and use them to smooth, flatten and even out the top.
Dust the top with confectioner's sugar. Allow it to sit in a cool room for several hours or overnight BEFORE cutting.
To cut, use a greased knife, bench scraper or cookie cutters to make squares ( size is your preference) or other shapes. Sprinkle with more confectioner's sugar and some cornstarch once placed in a ziploc bag for storage to prevent sticking. Shake bag gently to distribute the powdery mix.
These can be stored for several days at room temperature.