Hike up to Hafelekarspitze and ski down the obvious couloir on the backside – just passing the cross – down to the bottom of Gleirschzaehne (no need to try to pronounce it – Zaehne means teeth, the rock looks it). Put on the skins to skin up to Mandelscharte. From here, via Arzler Scharte all the way down to Hungerburg to get back to the resort. If there is no tracks avoid getting too low to traverse back skiers right.
The run gets tracks especially in good conditions, but in high Winter with a solid snow pack this feels too good to be true. The views are nothing short of stunning…
There is Alternatives from Mandelscharte over to Halltal if you fancy a classic crossing of Karwendel…