If there’s one thing I believe, it’s that we eat with our eyes first. And friends, this Cheesy Root Vegetable Gratin understood the assignment!

Layers of russet potatoes, sweet potatoes, and beets are tucked into a garlicky béchamel sauce and topped with a generous blanket of bubbly, golden Gruyère cheese. The beets turn everything the most beautiful shade of pink, making this dish an absolute showstopper on your Thanksgiving table.

This gratin is the kind of recipe that looks like you spent all day in the kitchen (don’t worry, I won’t tell anyone otherwise).

And while I love making something extra special for Thanksgiving, I have a little confession: I don’t think beautiful food should be reserved for holidays. You might be selling yourself short week after week in the meal department my friends. Let’s fix that.

How to Make Everyday Meals Feel Special

Thanksgiving comes once a year, but what about the other 364 days?

I love a beautifully set table and a meal made with love as much as the next person. But between work, kids, and everything else life throws our way, I know that figuring out what to cook every single night can feel like a full-time job. And that’s coming from someone who literally writes cookbooks for a living!

It’s exactly why I created Fraîche Table, my online meal planning platform.

Think delicious, tested recipes you’ll actually look forward to making, done-for-you weekly meal plans created by a dietitian who gets real life, and organized grocery lists that take so much of the thinking out of dinner.

Because I want you to enjoy beautiful, home-cooked food all year long, without spending your precious time wondering what’s for dinner.

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But first, let’s make this gorgeous gratin!

Cheesy Root Vegetable Gratin

A colourful, comforting side dish with thinly sliced root vegetables nestled in a creamy garlic and thyme béchamel, finished with melted Gruyère. It’s lighter than a traditional cream-based gratin but every bit as delicious.

Keyword gratin, root vegetable, Side dish

Servings 8

Ingredients

For the Béchamel:

3 cups whole milk
3 tablespoons butter
3 tablespoons all-purpose flour
2 garlic cloves minced
2 teaspoons fresh thyme leaves plus more for garnish
1 teaspoon salt plus more to taste
1/2 teaspoon black pepper
1/4 teaspoon ground nutmeg
2 tablespoons softened butter for greasing the dish

For the Gratin:

1 1/2 pounds russet potatoes peeled and thinly sliced into rounds
1 1/2 pounds sweet potatoes peeled and thinly sliced into rounds
1 pound beets peeled and thinly sliced into rounds
1 1/2 cups shredded Gruyère cheese

Instructions

Preheat the oven to 375°F. Grease a 9×13-inch baking dish with the softened butter.
Warm the milk. In a saucepan over medium heat, warm the milk until steaming, then remove from the heat.
Make the béchamel. In a separate saucepan, melt the butter over medium heat. Whisk in the flour and cook, whisking constantly, for about 1 minute, until lightly golden and fragrant. Gradually whisk in the warm milk, adding a little at a time and whisking well to keep the sauce smooth. Bring to a gentle simmer and cook for 5–7 minutes, whisking often, until thick enough to coat the back of a spoon. Add the garlic, thyme, salt, pepper, and nutmeg. Cook for another minute, then remove from the heat and let cool slightly.
Arrange the vegetables. Pour about half of the béchamel into the prepared baking dish. Working in small batches, stand the russet potato, sweet potato, and beet rounds upright in tight rows, alternating between the three vegetables to create a beautiful striped pattern. Season lightly with salt and pepper as you go.
Bake the gratin. Pour the remaining béchamel evenly over the vegetables, allowing it to settle between the slices. Cover tightly with foil and bake for 1 hour, until the vegetables are tender when pierced with a knife.
Add the cheese. Remove the foil and sprinkle the Gruyère evenly over the top. Return to the oven, uncovered, for another 20–25 minutes, until golden and bubbling. If the top browns too quickly, loosely tent it with foil.
Rest and serve. Let the gratin rest for 15 minutes before serving. Garnish with fresh thyme and enjoy!

A Few Tips for the Perfect Gratin

Use a mandoline. This is one recipe where a mandoline makes all the difference! Thin, even slices help the vegetables cook consistently and create those beautiful layers. Slice your beets slightly thinner than your potatoes, since they take a little longer to cook.

Don’t rush the baking time. The vegetables need time to become perfectly tender and soak up that delicious béchamel.

Let it rest. Giving the gratin 15 minutes to rest after baking helps everything settle before serving.

Good Food Isn’t Just for Special Occasions

If you loved this gratin recipe, I have a feeling you’ll love Fraîche Table. Because…why does good food have to be reserved for special occasions?

It’s my way of bringing a little more joy (and a lot less stress) into your kitchen. You’ll find hundreds of delicious, family-friendly recipes, weekly meal plans already created for you, and grocery lists that make shopping so much easier.

From a beautiful Thanksgiving gratin to a quick Wednesday dinner when everyone is hungry and you’re running on fumes, I’ve got you covered.

Because life’s too short for boring dinners. And it’s definitely too short to spend every afternoon wondering what to make.

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From my kitchen to yours, happy cooking!

xo Tori