Turn the stovetop to medium
Add the 3 cups of heavy cream and 5 oz of butter (1-¼ sticks) to the small sauce pan
Bring the cream and butter to a simmer on the stovetop
Remove the bowl from the mixer stand
Using a large, rubber spatula, gradually fold in the hot cream and butter mixture from the saucepan. This will take a few minutes.
Keep folding until the potatoes are smooth and creamy
Stir in the 2 tsp of salt, then taste and adjust if necessary
To serve, top with 1 oz of butter and sprinkle with chives