Prepare a 9x13 pan by lining it with foil and applying nonstick spray.
Either in microwave or on stovetop, carefully melt chocolate with canned milk and marshmallow cream. If microwaving, do it in short bursts because it can burn fast. Stir often.
When the mix is smooth, add the vanilla extract. Fold in the Oreos.
Refrigerate 3 hours until firm. Cut into bite size pieces. Keep stored in fridge.