In the heart of La Chapelle d'Abondance, take at the left the little road to Chevenne (good and typical restaurant with cheese specialities). Park at the end of the road.
The path leads along the torrent of Chevenne.
After 10 minutes don't follow the GR 5 but turn to the right and follow the comb over the chalets Toper.
Climb on a good path to the Col de la Vernaz (1815 m, fronteer between France and Switzerland). Walk higher on the left to the ferme de la Calaz (2067 m, highest summer farm of the Chablais).
Climb up a pasture coomb with late snow fields in july and reach a rocky zone with lapiaz near the Col de Chaudin (beautiful view down on the "Chaux du milieu", a wild red rock zone with the most time presence of mountain goats).
From here easy to the grassy summit (3h 30 from Chevenne)
Telescopic sticks are useful.