The Best Potato Purée

Ingredients

• 3.3 lbs Yukon gold or yellow potatoes, peeled and cut in 2 inches cubes same size
• 6 oz butter unsalted, melted with the hot milk (below)
• 1 cup milk whole, warm, mixed with melted butter (above)
• 2 teaspoons kosher salt
• 1/8 teaspoon white, ground pepper
• 1/2 teaspoon ground nutmeg