Add potatoes, salt, half and half, garlic, bouquet garni, and bay leaf into a large saucepan and gently boil for 12-15 minutes until potatoes are just fork tender.
Strain potatoes and reserve the cream mixture but discard the bay leaf, garlic, and bouquet. Let potatoes dry out a little in the pan.
Pass the potatoes through a food mill or a ricer into a large mixing bowl.
In the pot, brown the butter, add back in the cream mixture, and reduce for a bit. Add back in to the potatoes along with the mayo, sour cream, parm, and roasted garlic. Mix well until creamy and combined. Season as desired
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