Place a piece of parchment paper onto a cookie sheet, tray, or on your counter to decorate the cookies.
Melt the white candy melts according to package instructions.
Dip the bottom half of an Oreo cookie into the melted white candy to create the "snow". Place onto parchment paper.
Sprinkle generously with white sugar sprinkles.
Place a single chocolate Jimmie sprinkle vertically for the tree trunk in the top middle of the "snow".
Melt the green candy melt according to package instructions.
Once melted, transfer to a disposable piping bag or plastic food bag.
Cut a tiny hole at the end of the piping bag or in the corner of the food bag.
Pipe a triangle tree on the Oreo cookie, covering a tiny piece of the trunk and filling most of the height of the cookie.
Sprinkle with the Christmas sprinkles on the tree for the "ornaments".
Place a star-shaped sprinkle or candy at the top of the tree.
Leave the decorated cookies to dry for about an hour before eating.
Enjoy and Happy Holidays!