In a medium mixing bowl, preferably microwave-safe plastic, melt the chocolate chips in the microwave for 1 to 2 minutes. Stir in the shortening until both are well combined.
Slip a toothpick into the center of the filling of one Oreo cookie. Holding the cookie by the toothpick, dip the cookie into the melted chocolate. Allow any excess to drip off and place the dipped cookie onto the prepared sheet. Sprinkle with the colored sprinkles.
Allow the dipped treats to sit until the chocolate is completely set. Then remove from the sheet and store in an airtight container, layered between waxed paper.
Store cookies in an airtight container.Nutritional values are approximate and based on 1 cookie.