Prepare an 8x8 inch square pan and line with parchment paper or foil, leaving some overhang on the sides for easy removal later.

Spray with a thin layer of non-stick spray. Set aside.

Using a food processor or a ziploc bag and a rolling pin, crush the Oreos until course and crumbly. Some bigger pieces can remain. Set aside.

In a microwave-safe bowl, combine chocolate chips and the sweetened condensed milk.

Microwave in 30-second intervals, stirring after each interval, until the mixture is smooth and melted. Do not over heat - the chocolate can scorch and ruin the batch.

Add in the vanilla and stir well.

Fold in approximately 3⁄4 of the crushed Oreo pieces, reserving a handful for topping

Pour the fudge mixture into your prepared pan. Spread with the spatula until it is even and reaches the sides.

Sprinkle the remaining Oreo pieces on top of the fudge and gently press into the fudge to help secure the crumbs in place.

Refrigerate the fudge for at least 2-3 hours, or until firm

Once set, the fudge can be cut into small chunks and served