Ingredients:

500 gm (17.6 oz) bar of 72% dark chocolate from Trader Joe’s. Can use semi-sweet , if you prefer )
4 oz white chocolate, chips or bar 
10 oreo type cookies, with the filling removed from half of them, crushed
7-10 starlight mints, crushed

Instructions:

Line 2 small (I use two 8.5″ x 12″) or 1 large cookie tray(s) with parchment paper.
Break up the chocolate bar into pieces (roughly 1″ x 2″). Place in a large round pyrex bowl.
Microwave on high for 2 mins. Stir to melt completely, then stir in the crushed cookies.
Place white chocolate in a small pyrex bowl, microwave on high 45 – 60 secs. stir to melt completely.
Pour  dark chocolate mix onto prepared trays and spread evenly. Should be 1/4″ to 3/8″ thick.
Dribble white chocolate over the dark chocolate. 
Zigzag a dinner knife tip or a chopstick tip through the chocolate to produce a marble design or any design you like. 
Sprinkle the crushed mints over the top. 
Refrigerate at least 1 hour.
Break into pieces. Store in airtight container in refrigerator.