From La Morte or Lavaldens: head east after Moulin Vieux and park at the end of the tarmac road, at an altitude of 1,223 metres.
(S/E) Walk eastwards at first, then quickly turn south onto the path that crosses the Ruisseau de Vaunoire and climbs steeply, due south, towards Combe Oursière.
(1) At the fork, continue left towards the south-east and head for the Combe Oursière hut.
(2) Take care after the hut, as the path can sometimes be hard to follow, but the route south, then east along the Combe is fairly obvious.
(3) Head due east up the slope at the top of the valley towards the pass; there are a few rocky sections, which are no problem in dry, clear weather but may be trickier if wet. And the slope is steep here! Reach the Col de Combe Oursière.
(4) From the pass, at an elevation of 2,446 metres, there’s a panoramic view of the Grand Armet, Taillefer, Grandes Rousses, Muzelle, and Plancol below, which serves as your target for the descent.
After the pass, the descent is quite steep, but it’s manageable as there are quite a few cairns, which point south-east towards what remains of the Grand Glacier, allowing you to weave your way between the ridges (elevation 2098).
(5) Then head north-east: do not descend between the two torrents (contour line 1950 on the IGN map), but instead stay well on the left bank… of the one on the left.
A different route is shown on the OSM base map.
(6) Further down, there are picturesque landscapes along the Vaunoire, opposite Plancol.
Turn left after crossing the stream. Join a good path and follow it to the left. Cross the Ruisseau de Vaunoire and follow it along its banks. Further on, cross it again and turn due west, still following its course, to return to the starting point (S/E).