Mashed Potatoes with carrot

4 potatoes , red works best 4 carrots , peeled and chopped 1/4 cup onion , diced and sauted 1/4 cup milk , warmed 1/4 cup butter , softened 1/4 cup cream[...]

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[...]