Cut the marshmallows in half using scissors (or a serated knife) around the middle to make two round discs per marshmallow. Place in a small bowl.
Put the candy melts in a medium bowl and melt as per package directions. Stir well between each microwave session until completely melted.
Take one marshmallow half and if needed, shape them into a rounder or oblong pumpkin shape. Place it on top of the prongs of a fork.
Using a spoon, spoon the melted orange candy over the marshmallow, while holding it over the bowl with the fork, until completely coated. Tap the fork against the side of the bowl to remove the excess candy melt.
Push the marshmallow off the fork with your spoon and onto parchment paper. Repeat this process with the remaining marshmallows. Let the candy melts harden before piping on the faces (this only takes a few minutes, so by the time you are done covering the marshmallows in candy melts, the first pumpkins should be dry).
Practice piping on the parchment. I have not found a piping gel with a small enough tip for piping this small face, so I use a toothpick. Holding the piping gel vertical so that the open end is facing up, squeeze out just a little of the gel. Roll or scrape the end of the toothpick in this gel to transfer it to the pumpkins.
Carefully dab the gel onto the pumpkin where you want an eye to be and use the toothpick point to make a triangle shape. Repeat for the second eye, going back for more piping gel as needed.
Use the toothpick to start on the jack-o-lantern mouth in one corner. The tip of the toothpick can be used to create edges and lines around teeth as desired. If you get gel where you do not want it, simply wipe it off before it dries.
Repeat this process with each pumpkin. The gel will dry at room temperature.
Notes
Getting the gel technique down with the toothpick is tricky at first, stick with it! You can try piping it with the smallest opening you can cut/find as well but it will likely be larger in pattern.These marshmallows are fun as-is, or in a cup of hot chocolate!Keep them away from heat or warmth when finished as the candy melts and gel will soften and melt.The faces can be difficult to apply since the pumpkins are so small and this step takes the most time. I used a toothpick dipped in the black gel which was a little more tedious, but kept the face small. Alternatively, you could use jumbo marshmallows to make big ones, and the piping gel should be the perfect size.I found the marshmallows and candy stick to a cooling rack, even if sprayed. You can get them off with a knife but lose some of the bottom pieces. Now I put them straight on parchment to dry, but be sure that most of the extra candy was tapped off. Otherwise, it will pool around the pumpkins and make a ring.