Melt the butter in a saucepan and add the brown sugar, boil to 290 degrees. Stirring the ENTIRE time.
Grease a greased jelly roll pan/cookie sheet with sides and sprinkle with ground pecans.
Pour the butter/brown sugar crunch mixture onto the pecans.
Melt the Hershey bars and spread over the hot crunch layer.
Sprinkle with more ground nuts.
When cool break into pieces.