You can decorate your cookies while they’re still on the parchment paper – it will help catch all of the excess frosting and sprinkles.
You can also decorate your cookies like a pro with a DIY pastry bag made of parchment paper you already have in the kitchen. It's easy to do: take a triangle shaped piece of parchment paper and curl it up into a pastry bag. Scoop frosting into the center so you can frost and decorate each cookie with precision. Take a look at these step by step instructions on how to make your own pastry bag.