This Cheesy Root Vegetable Gratin combines earthy parsnips, sweet carrots, and creamy Yukon Gold potatoes in a rich, cheesy béchamel. It's a hearty side that stands up to roast chicken or a holiday ham, and it's surprisingly simple to assemble.
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The key is slicing the vegetables thinly and evenly so they cook at the same rate. A mandoline makes quick work, but a sharp knife works fine. The sauce is a classic béchamel with a generous amount of Gruyère and sharp cheddar, which creates a silky texture and a golden, bubbly crust.
I've tested this gratin multiple times to get the balance of cream, cheese, and vegetables just right. The result is a dish that's both elegant and comforting, with a crispy top and tender, flavorful layers underneath.
Why You'll Love This Recipe
About the Ingredients
2 lbs (900g) Yukon Gold potatoes, peeled and sliced 1/8-inch thick
Yukon Golds hold their shape and have a buttery flavor. Substitute with russets or red potatoes; if using russets, slice slightly thicker to avoid mushiness.
1 lb (450g) parsnips, peeled and sliced 1/8-inch thick
Parsnips add a subtle sweetness and earthiness. If unavailable, use celery root or turnips; adjust cooking time if using turnips as they may soften faster.
1 lb (450g) carrots, peeled and sliced 1/8-inch thick
Carrots provide color and natural sweetness. Baby carrots can be used but slice them lengthwise to get similar size pieces.
2 cups (480ml) heavy cream
Heavy cream creates a rich sauce. For a lighter version, use half-and-half, but the gratin will be less decadent.
1 cup (240ml) whole milk
Whole milk adds creaminess without being too heavy. You can use 2% but the sauce may be thinner; avoid skim for best texture.
3 tablespoons (45g) unsalted butter, plus more for greasing
Butter is used in the roux and for greasing the dish. Use salted butter and reduce added salt if you prefer.
3 tablespoons (24g) all-purpose flour
Flour thickens the béchamel. For gluten-free, use a 1:1 gluten-free flour blend.
2 cups (200g) shredded Gruyère cheese
Gruyère melts beautifully and adds nutty flavor. Substitute with Swiss, Emmental, or a mix of Gruyère and sharp cheddar.
1 cup (100g) shredded sharp cheddar cheese
Cheddar adds sharpness and color. Use a good melting cheddar; aged cheddar works well.
1 teaspoon salt, plus more for layers
Salt enhances flavors; adjust to taste. Use kosher salt if you prefer.
1/2 teaspoon black pepper, freshly ground
Freshly ground pepper adds a subtle kick; adjust to taste.
1/4 teaspoon ground nutmeg
Nutmeg complements the creamy sauce and root vegetables. Freshly grated is best; omit if not a fan.
Tips & Tricks
- Use a mandoline or a very sharp knife to slice vegetables uniformly. Consistent thickness ensures even cooking and a neat presentation.
- Don't skip the béchamel. It's the foundation of the creamy sauce; whisk constantly to avoid lumps and cook the flour for at least a minute to remove raw taste.
- Let the gratin rest for 10 minutes after baking. This allows the sauce to set slightly, making it easier to slice and serve without falling apart.
Pro Tips
Step-by-Step Instructions
1. Preheat and Prep
Preheat oven to 375°F (190°C). Grease a 9×13-inch baking dish with butter. Slice all vegetables thinly using a mandoline or sharp knife.
2. Make the Béchamel
In a medium saucepan, melt butter over medium heat. Whisk in flour and cook for 1-2 minutes until golden and bubbly. Gradually whisk in cream and milk, stirring constantly until smooth. Bring to a simmer, then reduce heat and cook until thickened, about 5 minutes. Remove from heat and stir in half of the Gruyère and cheddar until melted. Season with salt, pepper, and nutmeg.
3. Layer the Vegetables
Arrange a layer of potatoes, parsnips, and carrots in the prepared dish, slightly overlapping. Sprinkle with a pinch of salt and pepper. Pour a thin layer of sauce over the vegetables. Repeat layering until all vegetables are used, ending with a final layer of sauce.
4. Top with Cheese
Sprinkle the remaining Gruyère and cheddar evenly over the top. For extra crunch, you can add a breadcrumb mixture now.
5. Bake Covered
Cover the dish with foil and bake for 30 minutes. The foil traps steam, helping the vegetables cook through and become tender.
6. Uncover and Brown
Remove the foil and continue baking for 20-25 minutes, until the top is golden brown and the edges are bubbling. A knife inserted into the center should meet little resistance. If the top browns too quickly, tent loosely with foil.
7. Rest and Serve
Let the gratin rest for 10 minutes before serving. This allows the sauce to set, making it easier to serve. Garnish with fresh thyme if desired.
Delicious Variations
- Add caramelized onions or leeks between the layers for extra sweetness and depth.
- Swap the Gruyère for smoked gouda or fontina for a smoky, creamy twist.
- For a gluten-free version, use cornstarch instead of flour in the béchamel and skip the breadcrumb topping.
How to Store Cheesy Root Vegetable Gratin | Spoon Fork Bacon
Refrigerator
Store leftovers in an airtight container in the refrigerator for up to 4 days.
Freezer
This gratin freezes well. Assemble (without baking), cover tightly, and freeze for up to 3 months. Thaw overnight in the refrigerator before baking.
Reheating
Reheat individual portions in the microwave or oven at 350°F (175°C) until warmed through. For a crispy top, reheat in a toaster oven or under the broiler for a few minutes.
Frequently Asked Questions
Q: Can I make this gratin ahead of time?
Yes, you can assemble the gratin up to 24 hours in advance and refrigerate it unbaked. When ready to bake, add 10-15 minutes to the covered baking time since it starts cold.
Q: Can I use other root vegetables?
Absolutely. Try celery root, sweet potatoes, or turnips. Adjust the amount of cream if needed, as some vegetables release more liquid.
Q: How do I get a crispy top?
For a crispier topping, mix 1/2 cup panko breadcrumbs with 2 tablespoons melted butter and sprinkle over the cheese before baking. Also, ensure the gratin is uncovered for the last 20 minutes to allow browning.
Q: Can I use half-and-half instead of heavy cream?
Yes, you can use half-and-half, but the sauce will be less rich and may be slightly thinner. For best results, keep the milk quantity the same and use half-and-half in place of the cream.
If you try this Cheesy Root Vegetable Gratin, let me know how it turns out in the comments below. And don't forget to share your photos with me on Instagram!
Cheesy Root Vegetable Gratin | Spoon Fork Bacon
Cheesy Root Vegetable Gratin: layers of potatoes, parsnips, and carrots in a creamy Gruyère sauce, baked until bubbling and golden. A comforting side dish that's perfect for holidays or weeknight dinners.
🧂 Ingredients
- 2 lbs (900g) Yukon Gold potatoes, peeled and sliced 1/8-inch thick
- 1 lb (450g) parsnips, peeled and sliced 1/8-inch thick
- 1 lb (450g) carrots, peeled and sliced 1/8-inch thick
- 2 cups (480ml) heavy cream
- 1 cup (240ml) whole milk
- 3 tablespoons (45g) unsalted butter, plus more for greasing
- 3 tablespoons (24g) all-purpose flour
- 2 cups (200g) shredded Gruyère cheese
- 1 cup (100g) shredded sharp cheddar cheese
- 1 teaspoon salt, plus more for layers
- 1/2 teaspoon black pepper, freshly ground
- 1/4 teaspoon ground nutmeg
📋 Instructions
- 1Preheat and Prep — Preheat oven to 375°F (190°C). Grease a 9×13-inch baking dish with butter. Slice all vegetables thinly using a mandoline or sharp knife.
- 2Make the Béchamel — In a medium saucepan, melt butter over medium heat. Whisk in flour and cook for 1-2 minutes until golden and bubbly. Gradually whisk in cream and milk, stirring constantly until smooth. Bring to a simmer, then reduce heat and cook until thickened, about 5 minutes. Remove from heat and stir in half of the Gruyère and cheddar until melted. Season with salt, pepper, and nutmeg.
- 3Layer the Vegetables — Arrange a layer of potatoes, parsnips, and carrots in the prepared dish, slightly overlapping. Sprinkle with a pinch of salt and pepper. Pour a thin layer of sauce over the vegetables. Repeat layering until all vegetables are used, ending with a final layer of sauce.
- 4Top with Cheese — Sprinkle the remaining Gruyère and cheddar evenly over the top. For extra crunch, you can add a breadcrumb mixture now.
- 5Bake Covered — Cover the dish with foil and bake for 30 minutes. The foil traps steam, helping the vegetables cook through and become tender.
- 6Uncover and Brown — Remove the foil and continue baking for 20-25 minutes, until the top is golden brown and the edges are bubbling. A knife inserted into the center should meet little resistance. If the top browns too quickly, tent loosely with foil.
- 7Rest and Serve — Let the gratin rest for 10 minutes before serving. This allows the sauce to set, making it easier to serve. Garnish with fresh thyme if desired.
Liam covers personal finance and investing for beginners, demystifying money management with clear, no-nonsense advice. He focuses on budgeting, saving, and long-term wealth building, often using real-life scenarios to illustrate concepts.
