how long to pressure potatoes
Reduce heat to low, maintaining high pressure, and cook for 30 minutes. Use quick-release method to lower the pressure. Drain potatoes and return them to pressure cooker. Add butter and milk and cover pressure cooker with lid for 5 minutes, allowing the heat from the potatoes to melt the butter and warm the milk. Remove lid. Season with kosher salt and white pepper, and use a hand masher to mash potatoes until lumps are mostly gone. Transfer to a bowl and serve hot.