Place in a medium sized pot and cover with cold water.
Add salt and bring to a boil, then reduce heat and simmer until potatoes are tender. Drain off the water.
Warm the cream (not hot, just warmed)
Using a potato masher, mash the potatoes together with the roasted garlic and butter.
Pour in the warm cream and with electric hand mixer (do not use immersion blender) combine on low speed until potatoes have no lumps. You can also continue to use potato masher if desired.
Do not over-mix, or potatoes will become glue-like.