Prepare a tin lined with parchment paper and keep aside.
Chop the Dark Baking Chocolate (1 cup) into small pieces.
Add the Oreo® Chocolate Sandwich Cookies (8) to a blender. You can grind it to a fine powder or can pulse it into small pieces.
Put the chopped chocolate in a microwave-safe bowl along with Sweetened Condensed Milk (200 gram) and heat it in the Panasonic Microwave Oven on high power for 2 minutes. Take it out of the microwave and stir well.
Stir until all the chocolate pieces melt and become a smooth consistency. Put back in the microwave for another few more seconds if needed.
Add the powdered biscuits and Assorted Nuts (1/2 cup) (reserve a few for garnish). Stir until everything is combined well.
Now pour this mixture into the prepared tin and spread out evenly. Sprinkle the reserved nuts.
Keep in the refrigerator for 3 to 4 hours or until it becomes firm. Once done remove from the tin and cut the fudge with a sharp knife into pieces. Cooking results may vary depending on microwave oven used.