A timeless French bistro classic, this comforting casserole layers richly seasoned ground beef under a blanket of buttery mashed potatoes, finished with golden melted cheese. Hachis Parmentier was born from the French tradition of transforming leftover pot-au-feu into a satisfying second meal, named after the 18th-century pharmacist who championed the potato.
Prep Time20 mins
Cook Time50 mins
Total Time70 mins
Servings4
Yield1 9×13-inch baking dish (4 servings)
Nutrition Facts
Per serving (estimated)
- 620 kcalCalories
- 32 gFat
- 14 gSaturated Fat
- 45 gCarbs
- 5 gFiber
- 6 gSugar
- 38 gProtein
- 720 mgSodium
- 1100 mgPotassium
- 180 mgCalcium
- 5 mgIron
- 18 mgVitamin C
- 180 mcgVitamin A
Ingredients
For the beef filling
- 1.5 lbs (700 g) ground beef
- 2 tbsp unsalted butter
- 1 large yellow onion, finely diced
- 2 cloves garlic, minced
- 2 tbsp tomato paste
- 1/2 cup beef broth
- 1 tbsp Worcestershire sauce
- 1 tsp dried thyme, salt and freshly ground black pepper to taste
For the potato topping
- 2 lbs (900 g) Yukon Gold potatoes, peeled and cubed
- 4 tbsp unsalted butter
- 1/4 cup whole milk or heavy cream
- 1/3 cup grated Gruyère cheese
- 1 large egg yolk
- 1/2 tsp ground nutmeg, salt and pepper to taste
For finishing
- 2 tbsp grated Gruyère or Parmesan cheese
- 1 tbsp chopped fresh parsley
Directions
- Preheat the oven to 400°F (200°C) and butter a 9×13-inch baking dish.
- Place the cubed potatoes in a large pot of salted water and boil until fork-tender, about 18 minutes; drain well.
- Return potatoes to the pot over low heat, mash with butter and milk, then beat in the egg yolk, Gruyère, nutmeg, salt, and pepper until smooth and fluffy.
- Meanwhile, melt butter in a large skillet over medium-high heat, sauté the onion for 4 minutes until translucent, then add garlic and cook 30 seconds more.
- Add the ground beef, breaking it up, and brown for 7-8 minutes until no pink remains; drain excess fat.
- Stir in the tomato paste, beef broth, Worcestershire sauce, thyme, salt, and pepper; simmer 8-10 minutes until the mixture thickens and most liquid has evaporated.
- Spread the beef mixture evenly in the prepared baking dish and top with the mashed potatoes, using a fork to create decorative ridges across the surface.
- Sprinkle the top with the remaining grated cheese and bake for 25-30 minutes until the top is golden brown and the filling bubbles at the edges.
- Let rest for 10 minutes to firm up, garnish with fresh parsley, and serve hot in squares.
Cook’s Notes
- For the best mashed topping, use starchy Yukon Gold or russet potatoes and mash while still hot so they absorb the butter smoothly.
- Make sure the beef filling is thick and not watery before topping, otherwise it can seep up through the potatoes during baking.
- For deeper flavor, deglaze the beef pan with 1/4 cup dry red wine before adding the broth.
- Assemble up to a day ahead, refrigerate, and add 10 extra minutes to the baking time when cooking from cold.
- Leftover pot-au-feu beef or roast beef shredded finely is the traditional choice and works beautifully in place of ground beef.










