Very lightly butter a parchment lined baking sheet, set aside
Break the Oreos into large pieces by hand
Melt the chocolate chips in a small saucepan on medium-low heat, watch carefully so they don't burn
When the chocolate is melted pour it on to the baking tray and spread it out
Scatter the Oreo pieces
Melt the white chocolate in a small bowl in the microwave on low heat setting, watching carefully. When it softens mix to make it smooth and put into a ziploc or icing bag. Cut a small hole at the tip and drizzle over.
Set in the fridge for a few minutes then break the bark into pieces. Enjoy!