Mashed Potato and Cauliflower Gratin
Mashed Potato and Cauliflower Gratin is a flavorful Continental Desserts & Baking dish prepared with quality ingredients. Put potatoes and 2 teaspoons salt in a large heavy saucepan and generously cover with cold water (about 2 1/2 quarts).
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Easy Prep ≤ 4 steps · Fast & beginner friendly
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Moderate 5–8 steps · Everyday home cooking
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Expert ≥ 9 steps · Multi-step advanced prep
Ingredients Required
Tap or click any ingredient to check off during cookingStep-by-Step Cooking Method
Follow numbered steps for authentic taste and perfectionPut potatoes and 2 teaspoons salt in a large heavy saucepan and generously cover with cold water (about 2 1/2 quarts).
Bring to a boil, then reduce heat, and simmer, partially covered, until potatoes are tender, 15 to 20 minutes.
While potatoes are boiling, heat 3/4 cup milk and 3 tablespoons butter in a small saucepan until butter is melted and milk is hot but not boiling.
Keep warm off heat, covered.
Drain potatoes well in a sieve or colander and return to hot saucepan.
Add milk mixture, Fontina, and pepper, and mash with a potato masher or fork to desired consistency.
Season with salt and keep warm, covered.
Bring a pot of well-salted water to a boil, then add cauliflower and garlic and simmer until cauliflower is very tender, 13 to 15 minutes.
Drain cauliflower in a colander and pulse with remaining 1/2 cup milk, 1/2 cup Parmigiano-Reggiano, and 3 tablespoons butter in a food processor until it's a chunky purée.
Stir together mashed potatoes and cauliflower mixture in a large bowl and season with salt and pepper.
Transfer to a buttered 3-quart flameproof shallow baking dish (not glass).
Heat oven to 425°F with rack in middle.
Melt remaining 2 tablespoons butter and gently brush over potato-cauliflower mixture, then sprinkle evenly with remaining 1/4 to 1/2 cup Parmigiano-Reggiano (to taste).
Bake until potato mixture bubbles around edges, about 20 minutes.
Turn on broiler and broil 6 to 8 inches from heat until topping is browned in spots, 1 to 2 minutes.
Chef's Secret Tips & Serving Pairings
- Serve hot and fresh as a wholesome vegetarian meal.
- Pairs excellently with steamed rice, flatbreads, or fresh salad garnish.