How can I effectively put sprinkles on sugar cookies?

To effectively put sprinkles on sugar cookies, first, wait for the cookies to cool completely. Then, spread a thin layer of icing or frosting on the cookie and immediately sprinkle the sprinkles on top before the icing dries. This will help the sprinkles stick to the cookie. Alternatively, you can also dip the cookie into a bowl of sprinkles to coat it evenly.