The only way to make fluffy marshmallows from scratch
Place the corn starch and powdered sugar in a fine-mesh strainer and sift part of the mix onto a baking sheet covered with wax paper. Continue with the rest, but this time sift it over a large plate.
Brush several metal molds (whatever shape of marshmallow you're planning on making) with oil, and place them on the powdered baking sheet.
More steaming articles
Chef Tips and Tricks
How to make fast-food style mayonnaise in a pinch!