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Why This Recipe Works
- Two-texture vegetables: Silky potatoes and nubbly roasted turnips give each forkful contrast.
- Roasted, not raw, garlic: Caramelizing a whole head tames the bite and adds mellow sweetness.
- Infused cream: Steeping rosemary in the dairy perfumes every bite—no woody needles in sight.
- Make-ahead friendly: Reheats like a dream with an extra splash of milk.
- Vegetarian main or side: Serve in a bowl topped with sautéed greens and a fried egg, or alongside roast chicken.
- Holiday show-stopper: The pale-green confetti of rosemary oil on top looks elegant on any buffet table.
Ingredients You'll Need
Yukon Gold potatoes are my go-to for mashing; their naturally buttery flesh and thin skins mean you can skip peeling if you’re short on time. The skins also add flecks of rustic texture. If you only have Russets, peel them first—their thicker, tougher jackets won’t break down.
Turnips often sit ignored in the produce aisle, but once roasted their peppery edge mellows into something almost honeyed. Look for small-to-medium bulbs that feel rock-hard; soft spots signal woodiness inside. Purple-top varieties roast deepest in flavor, but golden or white turnips work just as well.
Roasted garlic is the quiet hero here. A whole head, drizzled with olive oil and wrapped in foil, turns jammy and sweet in about 40 minutes. Squeeze out the cloves and fold them into the mash for layers of flavor you can’t get from a simple sauté.
Heavy cream gives the luxurious texture we all secretly want in holiday potatoes. If you need a lighter version, swap in half-and-half or even whole milk, but reduce the volume slightly and warm it well so it doesn’t cool the potatoes.
Fresh rosemary perfumes the cream while it heats; strain the needles out so every bite is silky. In a pinch, thyme or sage can substitute, but rosemary’s piney scent is what makes the dish taste like winter forest.
Unsalted butter lets you control seasoning. I prefer European-style for its higher fat content and cleaner melt. Save a tablespoon to brush over the top just before serving; the sheen photographs beautifully.
How to Make Creamy Garlic Mashed Potatoes with Roasted Turnips and Rosemary
Roast the garlic
Preheat oven to 400 °F (204 °C). Slice the top quarter off a whole head of garlic to expose the cloves. Drizzle with 1 tsp olive oil, wrap loosely in foil, and place directly on the oven rack or on a small baking sheet. Roast 35–40 min until the cloves are golden and soft. Cool slightly, then squeeze out the pulp into a small bowl; mash with a fork.
Roast the turnips
While the garlic roasts, peel 1½ lbs turnips and cut into ¾-inch cubes. Toss with 1 Tbsp olive oil, ½ tsp kosher salt, and ¼ tsp black pepper. Spread on a parchment-lined sheet pan and slide into the oven (you can share the shelf with the garlic). Roast 25–30 min, turning once, until edges are chestnut brown and centers are tender. Set aside.
Infuse the cream
In a small saucepan combine 1 cup heavy cream, ½ cup whole milk, 2 sprigs fresh rosemary, and 4 Tbsp unsalted butter. Warm over medium-low heat until butter melts and small bubbles appear around the edges, about 5 min. Remove from heat, cover, and steep 10 min. Strain, discarding rosemary; keep warm.
Cook the potatoes
Scrub 2½ lbs Yukon Gold potatoes and cut into 1-inch chunks. Place in a large pot, cover with cold salted water by 1 inch, and bring to a boil. Reduce heat and simmer 12–15 min until a knife slides through with no resistance. Drain well, then return potatoes to the hot pot for 1 min to evaporate extra moisture.
Mash and fold
Rice the potatoes or mash by hand. Add roasted garlic pulp, 1 tsp kosher salt, and half of the warm cream mixture. Fold gently; add more cream until the texture is loose and luxurious. Gently stir in the roasted turnips, reserving a few pretty cubes for garnish.
Season and serve
Taste and adjust salt and freshly ground black pepper. Transfer to a warmed serving bowl. Drizzle with rosemary oil (see Pro Tips) or simply top with a pat of butter and the reserved turnips. Serve hot.
Expert Tips
Keep everything warm
Cold dairy stiffens potatoes. Warm your cream, butter, and even the mixing bowl so the mash stays supple.
Rosemary oil garnish
Blitz ¼ cup olive oil with 1 Tbsp fresh rosemary leaves and a pinch of salt. Let stand 30 min, strain, and drizzle for a restaurant-worthy finish.
Don't over-mash
Potatoes turn gluey if worked too much. Fold just until combined for the fluffiest texture.
Make-ahead magic
Prepare up to 24 hrs early; refrigerate in a buttered dish. Reheat, covered, at 325 °F with an extra splash of milk, 25–30 min.
Color contrast
Reserve a handful of roasted turnips and scatter on top just before serving for flecks of amber against the creamy backdrop.
Freezer savvy
Portion leftovers into zip bags, press flat, and freeze up to 2 months. Thaw overnight in the fridge and reheat gently.
Variations to Try
- Smoky bacon twist: Fold in 4 slices of crisp, crumbled bacon and swap rosemary for thyme.
- Dairy-light: Replace cream with unsweetened oat milk and olive oil for a vegan version; use miso-roasted garlic for umami.
- Cheese lovers: Stir 1 cup grated aged white cheddar into the hot mash until melted and silky.
- Spice route: Add ½ tsp ground cumin and ¼ tsp smoked paprika to the turnips before roasting.
- Spring refresh: Swap turnips for roasted asparagus tips and replace rosemary with fresh mint and lemon zest.
Storage Tips
Refrigerate: Cool completely, transfer to an airtight container, and refrigerate up to 4 days. Press plastic wrap directly onto the surface to prevent a skin.
Freeze: Spoon into freezer-safe containers, leaving ½-inch headspace. Label and freeze up to 2 months. Thaw overnight in the refrigerator, then reheat gently with a splash of milk.
Reheat: Warm in a covered baking dish at 325 °F until heated through, stirring once and adding milk as needed. Microwave works in a pinch—use 50 % power and stir every 45 seconds.
Frequently Asked Questions
Creamy Garlic Mashed Potatoes with Roasted Turnips and Rosemary
Ingredients
Instructions
- Roast the garlic: Preheat oven to 400 °F. Trim top of garlic head, drizzle with 1 tsp oil, wrap in foil, and roast 35–40 min. Squeeze out pulp and mash.
- Roast the turnips: Toss cubes with 1 Tbsp oil, ½ tsp salt, and ¼ tsp pepper on a sheet pan. Roast 25–30 min until browned and tender.
- Infuse the cream: In a small saucepan combine cream, milk, butter, and rosemary. Warm until butter melts; steep 10 min, then strain.
- Cook potatoes: Boil potato chunks in salted water 12–15 min until fork-tender; drain well.
- Mash: Rice or mash potatoes. Fold in roasted garlic, half the warm cream mixture, and 1 tsp salt. Add more cream for desired looseness.
- Finish: Gently fold in roasted turnips, adjust seasoning, and serve hot with extra butter or rosemary oil.
Recipe Notes
Potatoes can be made up to 4 days ahead and reheated with a splash of milk. For an ultra-smooth texture, pass through a potato ricer before folding in the turnips.
