THE ULTIMATE CREAMY AND MEATY POTATO DISH! Learn how to cook Hachies Parmentier with Chef and Food Blogger Natalija Delepine! This easy yet indulgent dish made with layers of mashed potatoes and beef, topped with cheese. Hachis Parmentier is a classic French comfort-food dish popular the world over. These casserolle is named for pharmacist Antoine-Augustin Parmentier (1737-1813) who spent his life promoting the potato, having learned of their nutritional value. Although it isn’t as glamorous as other French dishes, Hachis Parmentier is lick your plate clean tasty and the family usually loves. Let’s cook together!