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Cheesy Turnip Au Gratin Recipe

If you’re on the hunt for a warm, comforting side dish that’s both unique and downright delicious, you’ve got to try this Cheesy Turnip Au Gratin Recipe. I absolutely love how it turns out – tender, cheesy turnips baked in a creamy sauce that’s the perfect low-carb substitute for traditional potatoes. When I first made this, my whole family went crazy for it, and I knew I had to share it with you because it’s really easy to make and just feels like a big, cheesy hug on your plate.

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Why You’ll Love This Recipe

  • Comfort Food Made Healthy: This recipe gives you all the creamy, cheesy goodness without the carb overload of potatoes.
  • Simple Ingredients: You’ll find everything in your local store, and they come together quickly with minimal fuss.
  • Versatility: Whether for weeknight dinners or holiday feasts, this au gratin fits right in.
  • Family Favorite: I’ve never met anyone who didn’t ask for seconds after tasting this cheesy turnip delight!

Ingredients You’ll Need

The beauty of this Cheesy Turnip Au Gratin Recipe lies in the simple but harmonious ingredients that create that rich, creamy texture and melt-in-your-mouth flavor. Let me share a few tips on picking the best ingredients for your dish.

Flat lay of fresh small turnips whole and sliced thin, a half stick of soft butter, two uncracked brown garlic cloves, a small white ceramic bowl with heavy whipping cream, a small white bowl with grated Parmesan cheese, a small white bowl with grated sharp Cheddar cheese, a small white bowl of fine white salt, a small white bowl of cracked black pepper, and a small white bowl with fine white glucomannan powder, all arranged in perfect symmetry on a clean white ceramic surface, placed on a clean white marble surface, soft natural light, photo taken with an iPhone, professional food photography style, fresh ingredients, white ceramic bowls, no bottles, no duplicates, no utensils, no packaging --ar 2:3 --v 7 --p m7354615311229779997 - Cheesy Turnip Au Gratin, turnip au gratin side dish, low-carb cheesy turnip bake, creamy turnip casserole, easy cheesy turnip recipe
  • Small turnips: Choose firm, smooth turnips without cracks to slice evenly; smaller ones cook more tenderly.
  • Butter: I always recommend unsalted, so you can control the salt level better.
  • Garlic: Fresh minced garlic adds just the right pop of flavor without overpowering the dish.
  • Heavy whipping cream: This is the secret to the ultra-creamy sauce—don’t skimp!
  • Parmesan cheese: Freshly grated Parmesan brings a nutty, savory depth to the cream.
  • Glucomannan or xanthan gum: These thickeners give the sauce body without flour or starch, perfect for keeping it low-carb and creamy.
  • Cheddar cheese: Sharp cheddar melts beautifully on top, creating that classic au gratin golden crust.
Note: You’ll find the complete list of ingredients, along with their exact measurements, in the printable recipe card at the bottom of this post.

Variations

One of my favorite things about this Cheesy Turnip Au Gratin Recipe is how you can personalize it to fit your taste or dietary needs. I often tweak the cheeses depending on what I have on hand or add fresh herbs for a seasonal twist.

  • Herb-infused: Adding a teaspoon of fresh thyme or rosemary to the cream sauce ups the flavor game; I love how it adds an earthy aroma.
  • Spicy kick: A pinch of cayenne or smoked paprika can give this comforting dish a subtle heat that wakes up your palate.
  • Dairy-free option: Swap heavy cream for coconut cream and use vegan cheese alternatives—I’ve tried this, and it’s surprisingly good!
  • Cheese swaps: Gruyère or mozzarella also melt beautifully if you want a milder or stretchier cheese topping.

How to Make Cheesy Turnip Au Gratin Recipe

Step 1: Thinly Slice the Turnips

Start by preheating your oven to 375°F — this sets you up perfectly for baking. Using a mandoline slicer, slice your turnips about 1/8 inch thick. If you don’t have a mandoline, a sharp knife works fine, but take your time for even slices. Even thickness is key here because you want all slices to cook uniformly and become tender without turning mushy.

Step 2: Sauté the Turnips in Butter

Heat 1 tablespoon of butter in a large saucepan. Add half of your turnip slices and toss them gently in the butter, cooking for about 3 minutes. Stir frequently but gently—this helps separate the slices and coats them in that rich, buttery goodness that forms the base of your au gratin. Your goal here isn’t to fully cook them, just to soften slightly and build flavor.

Step 3: Layer and Season the Turnips

Arrange the sautéed turnips in an overlapping pattern in an 8 or 9-inch baking dish. Season with salt and pepper to taste. Then sauté the remaining turnips in the other tablespoon of butter and layer those on top, seasoning again. This layering not only looks beautiful but helps flavors marry during baking.

Step 4: Make the Creamy Cheese Sauce

In the same pan, sauté the minced garlic in the leftover butter until fragrant—just about 30 seconds so it doesn’t brown. Stir in the heavy cream and bring it to a simmer. Add the grated Parmesan cheese and stir until it melts smoothly into the cream. Season carefully with salt and pepper, then whisk in the glucomannan (or xanthan gum). This step is a game changer! It thickens the sauce just right and gives you that indulgent texture without any flour or starch.

Step 5: Bake and Broil to Perfection

Pour the creamy sauce evenly over the layered turnips. Cover the dish tightly with foil and place it in your preheated oven for 35 minutes. Then, remove the foil and sprinkle the top with the grated cheddar cheese. Bake uncovered for another 10 to 15 minutes until the turnips are tender and the cheese is bubbly and golden. If you want that signature au gratin crispy top, switch your oven’s broiler on for 1 to 3 minutes—just keep a close eye so it doesn’t burn.

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Pro Tips for Making Cheesy Turnip Au Gratin Recipe

  • Even Slicing: Using a mandoline really speeds up prep and guarantees all slices cook evenly without some being mushy while others are firm.
  • Don’t Skip Thickener: I learned the hard way that without glucomannan or xanthan gum, the sauce stays runny; adding it creates that perfect creamy cling to each slice.
  • Layer Flavors: Don’t rush the sauté step—it adds depth, making this more than just baked turnips with cheese.
  • Watch the Broil: Broilers vary, so stay close and watch carefully—browning too long will turn your cheesy top from golden to burnt quickly.

How to Serve Cheesy Turnip Au Gratin Recipe

A black plate holds a dish with three main parts: on the left, there is a thick sausage with a rich brown, slightly shiny surface; in the middle and right, several layers of thin, creamy white potato slices are topped with melted golden cheese and sprinkled with small bits of green parsley. The potato layers show a soft and slightly browned texture, some slices being lifted by a dark fork held by a woman's hand. Behind the potatoes, there is a small bunch of fresh green parsley as garnish. A white marbled surface under a green textured cloth is visible beneath the plate. In the background, a white baking dish with more of the cheesy potato dish is partially visible. photo taken with an iphone --ar 2:3 --v 7 - Cheesy Turnip Au Gratin, turnip au gratin side dish, low-carb cheesy turnip bake, creamy turnip casserole, easy cheesy turnip recipe

Garnishes

I love finishing this dish with a sprinkle of freshly chopped parsley or chives—it adds a pop of color and freshness that cuts through the richness. Sometimes I grate a little extra Parmesan on top just before serving for an extra cheese hit that melts deliciously on warm bites.

Side Dishes

This au gratin pairs beautifully with roasted chicken or a juicy steak, and I also like to serve it alongside a crisp green salad to balance the indulgence. For a veggie-packed meal, steamed green beans or sautéed spinach make lovely companions.

Creative Ways to Present

For a dinner party, I’ve served this dish in individual ramekins for a charming touch—everyone loves their own bubbling little gratin. You can also layer it in a pretty ceramic casserole and bring it straight to the table for a cozy, family-style presentation.

Make Ahead and Storage

Storing Leftovers

I usually cover any leftovers tightly with foil or move them to an airtight container and refrigerate. They keep beautifully for up to 3 days and still taste great reheated.

Freezing

If I’m planning ahead, I portion the dish into freezer-safe containers before baking. It freezes well for up to 2 months. When ready to enjoy, I thaw overnight in the fridge before reheating to keep that creamy texture intact.

Reheating

To reheat, I pop leftovers in a 350°F oven, covered with foil, for about 20 minutes until warmed through. Then, a quick broil for a minute or two brings back that crispy cheese topping that I love.

FAQs

  1. Can I use regular potatoes instead of turnips in this au gratin recipe?

    You can, but the beauty of this Cheesy Turnip Au Gratin Recipe is its lightness and unique flavor profile. Potatoes will take longer to cook and introduce more carbs. If you love potatoes, you might want to try classic gratin dauphinois instead, but turnips provide that satisfying texture with fewer carbs.

  2. What is glucomannan, and can I substitute it?

    Glucomannan is a natural thickening fiber that helps give the sauce its luxurious texture while keeping the dish low-carb. If you don’t have it, xanthan gum works as a great substitute. Without either, the sauce tends to be runnier.

  3. Is this recipe suitable for keto diets?

    Absolutely! This Cheesy Turnip Au Gratin Recipe uses low-carb ingredients and replaces potatoes with turnips, making it perfect for keto and low-carb meal plans.

  4. Can I prepare this dish ahead of time?

    Yes! You can assemble the gratin a day ahead, keep it refrigerated, and bake when ready. Just add the cheese topping right before baking for the best melt and browning.

Final Thoughts

This Cheesy Turnip Au Gratin Recipe has become one of my go-to comfort dishes, especially when I want something cozy but lighter than traditional potato gratins. It’s a total crowd-pleaser and so satisfying after just a little prep. If you’re looking to switch up your side dish routine or impress guests with something a little unexpected, give it a try—I promise you won’t regret it. Let’s be honest, there’s nothing like cheesy, creamy baked goodness to make any meal feel special!

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Cheesy Turnip Au Gratin Recipe

5 Stars 4 Stars 3 Stars 2 Stars 1 Star 4.7 from 125 reviews
  • Author: Lauren
  • Prep Time: 25 minutes
  • Cook Time: 60 minutes
  • Total Time: 85 minutes
  • Yield: 9 servings
  • Category: Side Dish
  • Method: Baking
  • Cuisine: American
  • Diet: Low Carb

Description

Turnip au Gratin is a rich and creamy low-carb alternative to traditional potato gratin, featuring thinly sliced turnips baked in a cheesy Alfredo-style sauce made with heavy cream, Parmesan, and Cheddar cheese. This comforting dish combines tender turnips with a luscious cream sauce, topped with melted cheese and a golden-brown crust, perfect as a side or a satisfying vegetarian main.


Ingredients

Turnips

  • 2 lb small turnips

Butter and Seasoning

  • 2 tbsp butter (divided)
  • Salt and pepper to taste
  • 2 cloves garlic (minced)

Sauce

  • 3/4 cup heavy whipping cream
  • 2 ounces grated Parmesan cheese
  • 1/2 tsp glucomannan (or 1/4 tsp xanthan gum)
  • 3 ounces grated Cheddar cheese


Instructions

  1. Preheat Oven and Slice Turnips: Preheat the oven to 375ºF. Using a mandolin slicer, slice the turnips about 1/8 inch thick to ensure even cooking.
  2. Sauté Half the Turnips: In a large saucepan, heat 1 tablespoon of butter over medium heat. Add half of the turnip slices and toss to coat them in the butter. Cook for about 3 minutes, stirring frequently and separating the slices to prevent sticking.
  3. Arrange Turnips for Baking: Arrange the sautéed turnips in an 8 or 9 inch ceramic baking dish in an overlapping pattern. Season with salt and pepper. Repeat the sautéing process with the remaining tablespoon of butter and turnip slices, then layer those on top of the first layer in the baking dish.
  4. Prepare Cream Sauce: Add minced garlic to the pan with leftover butter and sauté for about 30 seconds until fragrant. Stir in the heavy whipping cream and bring the mixture to a simmer. Add grated Parmesan cheese and stir until melted. Season with salt and pepper, then whisk in glucomannan to thicken slightly.
  5. Assemble and Bake: Pour the cream sauce evenly over the arranged turnips in the baking dish. Cover the dish with foil and bake for 35 minutes to let the turnips cook through and absorb the flavors.
  6. Add Cheese and Continue Baking: Remove the foil, sprinkle the grated Cheddar cheese evenly on top, and bake uncovered for an additional 10 to 15 minutes until the turnips are tender and the cheese has melted.
  7. Optional Broiling: For a golden-brown crust, turn on the broiler and broil the gratin for 1 to 3 minutes, watching carefully to prevent burning.

Notes

  • This recipe offers a delicious low-carb alternative to traditional potato gratin by using turnips.
  • Thin slicing with a mandolin slicer ensures even cooking and tender texture.
  • Glucomannan or xanthan gum is used as a natural thickener to create a smooth sauce without flour.
  • Broiling at the end provides an appealing golden and slightly crispy top layer.
  • Great served as a side dish to meats or as a vegetarian entrée.

Nutrition

  • Serving Size: 1 serving (1/9th of recipe)
  • Calories: 183 kcal
  • Sugar: 2 g
  • Sodium: 200 mg
  • Fat: 13.7 g
  • Saturated Fat: 8.5 g
  • Unsaturated Fat: 4.2 g
  • Trans Fat: 0 g
  • Carbohydrates: 7.6 g
  • Fiber: 1.8 g
  • Protein: 5.9 g
  • Cholesterol: 55 mg

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