Mashed Potato and Cauliflower Gratin
Experience the comforting delight of potato and cauliflower gratin, a dish where tradition meets innovation. Perfect for family dinners and gatherings, this fusion of classic potatoes and nutritious cauliflower will tantalize your taste buds.

- Prep time
- 10 min
- Cook time
- 50 min
- Yield
- 8 servings
- Difficulty
- MEDIUM
Ingredients
Quantities are shown as originally provided.
- 1 kg Russet Potatoes
- Salt (adjust to taste)
- 300 ml Milk
- 8 tbsp Butter (unsalted)
- 100 grams Italian Fontina or Gruyère (coarsely grated)
- 1 tsp Black Pepper (adjust to taste)
- 1 Cauliflower (cut into small pieces)
- 3 cloves Garlic
- 100 g Parmesan Cheese
Instructions
- 1
Put the potatoes and 2 tsp of salt in a large saucepan and generously cover with cold water.
- 2
Bring to a boil, then reduce heat, and simmer, partially covered, until potatoes are tender, 15 to 20 minutes.
- 3
While potatoes are boiling, heat 200ml milk and the 3 tbsp butter in a small saucepan until butter is melted and milk is hot but not boiling. Remove from heat and keep warm, covered.
- 4
Drain the potatoes well in a sieve or colander and return to hot saucepan.
- 5
Add the milk mixture, Fontina or Gruyère, and black pepper, and mash with a potato masher or fork to desired consistency.
- 6
Season with salt and keep warm, covered.
- 7
Bring a pot of well-salted water to a boil, then add the cauliflower and garlic and simmer until cauliflower is very tender, 13 to 15 minutes.
- 8
Drain cauliflower in a colander and pulse with remaining 100ml milk, 50g parmesan cheese, and the remaining 3 tbsp butter in a food processor until it's a chunky purée.
- 9
Stir together mashed potatoes and cauliflower mixture in a large bowl and season with salt and pepper.
- 10
Transfer to a buttered baking dish (not glass).
- 11
Heat oven to 425°F with rack in middle. Melt the remaining 2 tbsp butter and gently brush over potato-cauliflower mixture, then sprinkle evenly with remaining 50g parmesan cheese (to taste).
- 12
Bake until potato mixture bubbles around edges, about 20 minutes.
- 13
Turn on broiler and broil 6 to 8 inches from heat until topping is browned in spots, 1 to 2 minutes.