Line an 8x8 baking dish with parchment paper, set aside.
Melt together the baking chips and sweetened condensed milk until smooth (this can be done on medium low heat on the stove top, or in the microwave in a large bowl in 30 second intervals).
Spread the mixture evenly into the prepared dish.
Allow to chill in the refrigerator at least 2 hours, then slice into squares.