Garlic Parmesan Mashed Potato Casserole Recipe

lbs. russet potatoes (, scrubbed, peeled and diced into 1” cubes)

garlic cloves (, whole)

kosher salt ((to season put in water for the diced potatoes))

unsalted butter

whole milk

parmesan cheese (, shredded and divided)

black pepper (, freshly ground)

kosher salt