This is a pretty clean rock route that heads directly from the base to the true summit.
Approach as for other east side routes and camp at the Palisade Glacier.
Start at the base of the Underhill Couloir and leave your ice gear here if possible. Scramble right 200' and up 200' over loose shitty terrain to the base of a right-facing, left-leaning, low angle dihedral. This is hard to see until you are under it. It is at the bottom of a huge white intrusion that angles up and left across the face.
Climb the dihedral then zag right up a large block-filled low angled crack system. When this crack ends, climb up a clean flake and zig left to a belay ledge. Climb another pitch almost horizontal across clean flakes and edges to the start of 3rd class terrain. This is approx 4 pitches of 130' each.
Carefully route find up ~400' of 3rd class to gain the summit ridge. Scramble north the short distance to the summit block.
A thin 50M rope, ~15 small/med cams/nuts, ~10 slings. Fishklr and I climbed this in rock shoes, carrying our mountain boots, but consider leaving your boots with your ice gear.
Scramble down beautiful 3rd/4th class rock to the top of the Underhill Couloir. Rappel and downclimb the couloir which is loose and dangerous if dry. You will
be causing rock fall so do not rappel over another party. If there is a party near you stay together in the couloir.