⅔cupbuttermilkcan substitute 1/2 heavy cream and 1/2 milk
½cupsour cream
½cupbutter
¼cuponionsdiced, small
2toesgarlicminced
pepperto taste
Instructions
Add peeled and quartered potatoes to InstaPot.
Cover potatoes with salted water (1-2 tsp salt)
Cover and cook on high pressure 10 minutes, quick release to check the potatoes are soft. They are done when a sharp knife can easily be inserted through the potato.
While potatoes are cooking, sauté onions in 2 tbsp of butter. Let onions and butter sauté until browned, adding in garlic toward the end. Do not add the garlic at the beginning or it will burn.
Add buttermilk (or half and half, or half heavy cream and half milk), sour cream, butter, and sautéed onion and garlic. Mash until well mixed.
Add in salt and pepper to taste.
Notes
Truly, the sour cream, butter, buttermilk, and other ingredients are more to taste than by actual measurements.