Melt chocolate in a microwave safe bowl in 30 second bursts. Take out stir and melt for another 30 seconds. Repeat this until there's only a few lumps in the chocolate. Keep stirring until the lumps dissolve.
Spoon the meted chocolate into the mold about 1/4 of the way up.
Place the Oreo cookie into the center of the mold.
Spoon the chocolate over the cookie and around the sides until the cookie is covered.
Place into the refrigerator about 5 minutes. Check to make sure the chocolate has hardened. This step is pretty quick.
When the chocolate has set, turn the mold over onto the wax paper and they should pop right out. Let them rest for a couple minutes so they're not too cool.
Dip you spoon into the melted chocolate, and with the back side go around the side of the cookie so it's wet. (You will need to work fast, as this dries quickly especially if the cookie is still a little cold.)
As you're holding the cookie grab some sprinkles, and sprinkle onto the wet chocolate. Set them down to dry.