Use a knife to split Oreos into two halves.
Melt chocolate in a microwave safe bowl according to instructions.
Dip the end of the popsicle stick into the melted chocolate. Place it in the middle of one side of the Oreo. Sandwich the other half back on top.
Place in the freezer for 5-10 minutes, or until the chocolate hardens.
Holding the Oreo pop over the bowl of melted chocolate, use a spoon to cover the entire Oreo. Tap the stick on the side of the bowl to get off any excess chocolate.
Place the sugar cactus.
Cover the Oreo in sprinkles and set aside to dry.