Mix all ingredients and pour into 3 greased cake pans.
Bake @ 350 degrees for 20 to 25 minutes.
Set aside on wire rack to cool.
Combine 1st 4 ingredients beating until smooth. Add nuts and hershey bars mixing together until well blended.
Ice cake in between each layer and then the entire cake making sure it is completely covered.
Store in refrigerator until ready to serve.