This is a recipe you only make if you are having people over.  Its got everything that is good in it and is dangerous to have in your house if you are like me and lack will power.  It does take a very long time to cool to the point that you can cut it.  So either make it the day before or put it in the fridge to finish cooling.  This was off of the Skinny Chick site which is quite ironic I think.

1. Preheat oven to 350º.
2. Line an 8×8 baking dish with non stick foil (or use regular foil and spray with cooking spray).
3. Make cookie dough by creaming butter and sugar, then mixing in egg. Mix in flour, salt and baking soda, then chocolate chips.
4. Press about 2/3 of dough into the bottom of the pan.
5. Melt chocolate chips and sweetened condensed milk together until smooth in the microwave.  Do 30 second intervals for around 2 minutes, stirring at each interval.
6. Spread melted chocolate over the cookie dough.
7. Sprinkle Heath bar chunks over melted chocolate.
8. Take spoonfuls of remaining dough and drop over chocolate layer. Carefully spread out lumps of dough with fingers. It will not totally cover chocolate.
9. Bake for 25-30 minutes. The top should be set, and golden.
10. Remove from oven to cooling rack. Cool completely before serving. It takes around 12 hours to solidify to the point you can cut it.  Or put it into the fridge once it has cooled down to the touch.