Allow the cookies to cool on the pan for 15 minutes before transferring them to a wire rack with a spatula to cool completely, about 1 hour more. Once cooled, melt the chocolate melting wafers in the microwave at 30-second intervals, stirring between each one until fully melted. Drizzle over the tops of the cookies and then top with holiday sprinkles and a mini Cadbury creme egg if desired. Let set at room temperature until the chocolate hardens, about 15 to 30 minutes.