Crispy Twice-Baked Mashed Potatoes Recipe

Twice-Baked Mashed Potatoes are a rich, comforting side of roasted garlic mashed potatoes finished with melted gruyere, crisp prosciutto, and fresh chives. This variation on the classic casserole delivers deep flavor and creamy texture, perfect for weeknight dinners or holiday spreads.

These twice-baked mashed potatoes are a favorite for Thanksgiving, Christmas, and family dinners. The creamy, roasted-garlic mash paired with a cheesy top and crunchy prosciutto makes them a crowd-pleaser. Serve alongside roasted meats, poultry, or roasted vegetables for a complete, comforting meal.

About Twice-Baked Mashed Potatoes

• Taste – Buttery mashed potatoes flavored with roasted garlic, Parmigiano-Reggiano, and a nutty gruyere topping.
• Texture – Silky, creamy interior with a crisp prosciutto topping and melted, slightly browned cheese.
• Effort – Straightforward steps: roast garlic and prosciutto, boil and mash potatoes, fold in dairy and seasonings, then bake.
• Time – Plan about 15 minutes active prep and roughly 1 hour+ total cooking time including roasting, boiling, and baking.

Ingredients

• Garlic bulbs – Roasting brings out sweet, nutty garlic flavor.
• Olive oil – For roasting the garlic.
• Prosciutto – Baked until crisp for a salty, crunchy garnish.
• Yukon Gold potatoes – Creamy and buttery when mashed. You can keep skins on for added texture.
• Butter – Adds richness; use a high-quality butter if possible.
• Parmigiano-Reggiano – Provides savory, sharp depth.
• Heavy cream – Makes the mash luxuriously creamy.
• Sour cream or crème fraîche – Adds tang and creaminess.
• Freshly ground black pepper – For seasoning.
• Gruyere or white cheddar – Shredded for the melted topping.
• Chives – Fresh, mild onion flavor to finish.

Refer to the recipe card for exact quantities.

Substitutions and Variations

• Red potatoes – Waxy and hold their shape; mix with Yukon for variety.
• Russets – Light and fluffy when mashed for a different texture.
• Stock – Boil potatoes in chicken or vegetable stock for extra flavor.
• Bacon or pancetta – Swap prosciutto for bacon or crispy pancetta if you prefer.
• Herbs – Add sage, rosemary, or thyme for an herby note.
• Green onions – Use instead of chives for a more pronounced onion flavor.
• Truffle – Add truffle oil or shaved truffle for an indulgent twist.

Instructions

Roasted Garlic and Prosciutto

• Prepare oven – Preheat to 400°F. Trim the papery outer layers of the garlic bulb and slice off about 1/4″ from the top to expose the cloves. Place each bulb cut-side up on a sheet of foil, drizzle with olive oil, and wrap tightly.
• Roast garlic – Place the wrapped garlic on a baking sheet and roast 40–45 minutes until soft and caramelized.
• Crisp prosciutto – Ten minutes before the garlic finishes, arrange prosciutto slices on a parchment-lined baking sheet without overlapping. Bake 8–10 minutes, watching closely, until crisp. Transfer to a wire rack to cool and then crumble or chop into small pieces.
• Extract garlic – Let the roasted garlic cool slightly, then squeeze the softened cloves from their skins. Reduce oven to 350°F for baking the casserole later.

Mashed Potatoes

• Boil potatoes – While the garlic roasts, add peeled or halved potatoes to a large pot, cover with cold water, bring to a boil, and simmer 15–20 minutes until fork-tender.
• Warm cream and butter – Heat butter and heavy cream in a small saucepan until hot but not boiling; remove from heat and set aside.
• Drain and mash – Drain potatoes and immediately rice or mash them into a large bowl for a smooth texture.
• Combine – Fold in the warm butter and cream, roasted garlic, grated Parmigiano-Reggiano, sour cream, chives, salt, and pepper. Add additional heavy cream by 1/4-cup increments if needed to reach a silky consistency.
• Transfer – Spread the mashed potatoes into a greased 9×13″ baking dish.
• Top and bake – Smooth the surface, sprinkle with grated gruyere (or cheddar), and bake uncovered at 350°F for 30–35 minutes until heated through and the cheese is melted and slightly golden.
• Garnish and serve – Remove from oven, scatter crispy prosciutto and extra chives over the top, and serve hot.

Pro tip – For added texture and rustic character, leave the skins on the potatoes when boiling and mash as usual.

What to Serve With Twice-Baked Mashed Potatoes

These potatoes pair beautifully with roasted turkey, roast chicken, steak, or vegetable mains. Serve them alongside sautéed greens, roasted squash, or a simple green salad for balance.

Storage

Store leftovers in an airtight container in the refrigerator for up to 3 days, or freeze for up to one month. Reheat uncovered in a baking dish at 350°F until warmed through, adding a splash of cream if needed to restore creaminess.

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