Line an 8 x 8 glass dish with foil and spray lightly with non-stick cooking spray.

In a large bowl, stir chocolate chip and sweetened milk together and microwave in 30 second intervals until smooth and completely melted.

Line the bottom of the dish with the Reese 's cups, then pour the melted fudge over top.

Chop remaining Reese 's cups and press them into the top.

Allow to come to room temp (about an hour) then place in fridge until solid.