Rinse and dry the cranberries. Prepare a sheet pan with either a silicone baking mat or parchment paper. Set aside. If desired, set a few cranberries aside so you can mix them with the sugared cranberries when you're done. This gives a nice contrast of sugared and non-sugared cranberries.
In a medium saucepan over medium heat, add 1/2 cup of water and 1 cup of sugar. Stir to dissolve the sugar completely into the water. It will look cloudy for a bit. Continue stirring. You don't want to burn the sugar.
After about 3-5 minutes, the sugar syrup should become clear and a little bit thicker. Remove from heat and set aside for one minute.
After one minute, add the cranberries to the syrup and fully coat the cranberries in the simple syrup.
Using a slotted spoon, transfer the cranberries to the prepared baking sheet, making sure they are in one layer. Let dry for one hour.
Add 1 cup of sugar to a large plate. After one hour, working in batches, add the cranberries to the sugar and roll them around to coat them in sugar. Transfer back to the sheet pan.
You can use them right away to decorate, but wait at least one hour before storing them in a container.