Check out How Sweet's original recipe here*! And follow her if you don't already, because if you're following this, you're clearly a foodie to some degree which means her blog and her mouth watering recipes are right up your alley.
(*As a side note, I accidentally bought semi-sweet chocolate chips instead of milk chocolate, and that worked out just as well! I've had them both ways, and the semi-sweet is still delicious but just tones down the sweetness a tiny bit, which may be good for those of you who don't like "sweet" in overwhelming quantities... though one could argue that in this case, this recipe might not be the one for you! ;-) )