Place the powdered sugar and cornstarch into a sifter and sift 2-3 times into a medium-size bowl to make it fluffy and to remove every single clump.

If you're wanting multiple colors, divide the powder into equal portions in small bowls according to the number of colors you want. Add a few drops of extract to each, if desired; then add the colorant and vodka a few drops at a time until the mixture becomes a very thick, smooth paste. Have a large piece of waxed paper, parchment paper, or a silicone baking mat at the ready.

Spoon the paste into a piping bag with a very fine, single round tip or into a sandwich baggie. Cut a tiny corner off of the sandwich bag after the paste is inside, if using.

Pipe the paste into long, thin lines down the length of your prepared sheet. Set aside and let dry until the insides are completely dry - the line will snap when you break it, about 24 hours. If you are in a hurry, you can place them in a food dehydrator on the very lowest or "fan only" setting for 4-6 hours.

Break the lines into the desired size and store in an airtight container for 3-6 months.