Mashed Potatoes with starch

2 tablespoons unsalted butter 4 ounces carrots (parsnips, turnips, or celery root, peeled, carrots or parsnips cut into 1/4-inch-thick half-moons, t) 3/4 lb[...]

5 lbs yukon gold potatoes , peeled and quartered 1 cup unsalted butter , melted 1 1/3 cups whole milk, warm salt and pepper 1 Wash, peel and quarter the[...]

2 lbs russet potatoes , peeled, eyes and blemishes removed, cut into 2 inch chunks. If using russets, they can simply be bak or 2 lbs yukon gold potatoes ,[...]