https://www.smokingmeatforums.com/threads/ny-loin-roast-red-potato-mash.303864/#post-2164730
There is one in this post (it will work with any type of spuds, we do skin on reds and Yukon golds). The secret is grated onion, crushed garlic, heated butter, heavy cream, Creme Fraich, and most importantly, some of the salty water they spuds were boiled in. This from Gordon Ramsay. The other secret is to cut the spuds exactly the same size cubs and toss the odds they go mushy.....GR uses a ricer, but my wife doesn't do it as she likes a little firmer.
Jed, I can get you more specifics later....but this the above is good reading for now....LOL
edit:
Here is how GR does his mash.....
8-10 mid size peeled Yukon’s cut into 1” (1/2" will work and cook faster) cubes (as above above toss the smaller sizes).
boil 20-22 min (we are at 4K) so maybe 18-20 at sea level, in heavily salted water... 1-2 Tbsp when close to the time - test, should be flaky & translucent but not soggy.
use a slotted spoon to remove and save boiling water....
Garlic part:
grate 1/2 a sweet onion (over a bowl so the juice is saved and crush 3-4 cloves of garlic, into a sauce pan with a cube of butter, 1/4c heavy cream, 2-3 Tbsp Creme Frisch and heat till hot
Next use a ricer to mash then whip in the hot garlic mixture and then add some of the boiling water, about 1/4 cup or so till they whip up smooth and silky. The boiling liquid is magic.....but don’t over whip.... season with salt and white pepper after the boiling liquid had been added to texture...
We then like to put a couple slices of butter on top then cover the dish in foil and heat in the oven @325 for 15-20 mins.
we got the recipe from GRs Hell’s Kitchen recipe book and GR mash is the same minus the onion and garlic. Having had GRs Yukon mash at Hell’s Kitchen in Vegas I can say they are one of the best tasting sides I have ever had in my life! We have come close but have yet to reach that level of mash but they are many times better than anything we had done before or had at any other restaurant since.....