Sweet Potato Gratin: 5 Easy Steps to Deliciousness

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Modified:December 11, 2025

Published:December 11, 2025

by Hassna Dali

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Sweet Potato & Cranberry Gratin: Your New Favorite Holiday Side!

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Oh, my friends, get ready to add a showstopper to your holiday table or a comforting classic to your weeknight rotation! Today, we’re diving into the absolute deliciousness of Sweet Potato & Cranberry Gratin. This dish combines the natural sweetness of sweet potatoes with a bright pop of tart cranberries, all enveloped in a creamy, savory sauce and baked to golden perfection. It’s a symphony of flavors and textures that you won’t soon forget.

Forget bland side dishes – this gratin is vibrant, rich, and utterly irresistible. It’s surprisingly simple to make, yet elegant enough for any special occasion. Let’s embark on this culinary adventure together!

1. Introducing the Creamy Dream: Sweet Potato & Cranberry Gratin!

There’s something magical about a gratin, isn’t there? Layers of thinly sliced vegetables baked with a decadent sauce until bubbly and golden. Our version takes it up a notch with the vibrant additions of sweet potato and tart cranberries, making it a feast for both the eyes and the palate.

This isn’t just a side; it’s a centerpiece in its own right. The combination of sweet and savory notes, along with the unexpected burst of cranberries, creates a truly unique and memorable dish. It’s the ultimate comfort food for cozy evenings.

2. Why You’ll Adore This Sweet Potato & Cranberry Gratin

This Sweet Potato & Cranberry Gratin is destined to become a staple in your recipe collection for so many reasons. First, it’s incredibly flavorful, offering a beautiful balance that pleases everyone. It’s also a fantastic way to introduce a touch of elegance without hours of kitchen stress.

Beyond its incredible taste, it’s also highly versatile. You can serve it alongside roasted meats, poultry, or even as a delightful vegetarian main course. Plus, it reheats beautifully, making it perfect for meal prep or enjoying delicious leftovers. For more amazing vegetable gratin recipes, check out these inspiring ideas!

3. What You’ll Need: Sweet Potato & Cranberry Gratin Ingredients

Gathering your ingredients is the first step to gratin glory. We’re keeping things simple, fresh, and full of flavor. These staples combine to create an unforgettable sweet potato dish.

  • 3 large sweet potatoes (about 3 lbs), peeled and thinly sliced (1/8-inch thick)
  • 1 cup fresh or frozen cranberries
  • 2 cups heavy cream
  • 1 cup whole milk
  • 2 cloves garlic, minced
  • 1 teaspoon fresh thyme leaves, chopped
  • 1/2 teaspoon salt, or to taste
  • 1/4 teaspoon black pepper, freshly ground
  • 1/4 teaspoon nutmeg, freshly grated (optional, but highly recommended!)
  • 1 cup Gruyère cheese, grated (or a mix of Parmesan and cheddar)
  • 2 tablespoons unsalted butter, softened (for greasing dish)

4. Let’s Get Cooking: Sweet Potato & Cranberry Gratin Perfection

Now for the fun part – assembling and baking our incredible Sweet Potato & Cranberry Gratin! This process is straightforward and incredibly rewarding. Just follow these easy steps for a perfect result.

4.1. Step 1: Prep Those Sweet Potatoes

  1. Preheat your oven to 375°F (190°C). Grease a 9×13 inch baking dish (or similar size) generously with softened butter.
  2. Peel the sweet potatoes and slice them very thinly, about 1/8-inch thick. A mandoline slicer works wonders here for uniform slices, ensuring even cooking.

4.2. Step 2: Create the Creamy Sauce

  1. In a large saucepan over medium heat, combine the heavy cream, whole milk, minced garlic, fresh thyme, salt, pepper, and nutmeg (if using).
  2. Bring the mixture to a gentle simmer, stirring occasionally. Do not boil. Remove from heat immediately once it starts to bubble slightly around the edges. This infuses the flavors beautifully.

4.3. Step 3: Layer It Up!

  1. Arrange a single layer of sweet potato slices in the bottom of your prepared baking dish, slightly overlapping them.
  2. Sprinkle about one-third of the cranberries and one-third of the grated Gruyère cheese over the sweet potatoes.
  3. Carefully pour about one-third of the cream mixture over the layer. Repeat this layering process two more times, ending with a generous sprinkle of cheese on top.

4.4. Step 4: Bake to Golden Brown Goodness

  1. Cover the baking dish tightly with aluminum foil.
  2. Bake for 45 minutes to 1 hour, or until the sweet potatoes are tender when pierced with a fork.
  3. Remove the foil, then bake for another 15-20 minutes, or until the top is bubbly and beautifully golden brown.

4.5. Step 5: Rest and Serve

  1. Once out of the oven, let the gratin rest for at least 10-15 minutes before serving. This allows the sauce to set and makes for easier, cleaner serving.
  2. Garnish with a few extra fresh thyme sprigs or cranberries if desired. Enjoy your delicious sweet potato side dish!

5. Tips & Tricks for the Best Sweet Potato & Cranberry Gratin Ever

Want to elevate your gratin even further? Here are a few secrets from my kitchen to yours! These little touches can make a big difference in your overall experience.

  • Uniform Slices: As mentioned, a mandoline slicer is your best friend here. Evenly sliced sweet potatoes ensure consistent cooking and a beautiful presentation.
  • Don’t Skimp on the Cheese: While Gruyère is fantastic, feel free to experiment with other cheeses like white cheddar, fontina, or even a touch of smoked gouda for a different flavor profile.
  • Spice it Up: For a hint of warmth, a pinch of cayenne pepper in the cream sauce can add a subtle kick that complements the sweetness.
  • Make Ahead: You can assemble the entire gratin a day in advance, cover it tightly, and refrigerate. Add an extra 10-15 minutes to the covered baking time if baking from cold.

6. Serving Suggestions: What to Pair with Your Gratin

This versatile sweet potato and cranberry gratin pairs wonderfully with a variety of main courses. Its rich, comforting flavors make it an ideal accompaniment for festive meals or simple family dinners. Here are some of my favorite pairings:

  • Roasted Turkey or Chicken: A classic holiday pairing that truly shines.
  • Pork Loin or Chops: The sweetness of the potatoes beautifully complements savory pork.
  • Grilled Steak: Adds a touch of gourmet comfort to a hearty steak dinner.
  • Vegetarian Feast: Serve it alongside a crisp green salad and some crusty bread for a satisfying meat-free meal.

Don’t forget to explore See others recipes here to find more fantastic pairings!

Foire Aux Questions

Can I make Sweet Potato & Cranberry Gratin ahead of time?

Absolutely! You can assemble the entire gratin, cover it tightly with plastic wrap, and refrigerate it for up to 24 hours before baking. When ready to bake, remove it from the fridge 30 minutes prior to bring it closer to room temperature, and then proceed with baking instructions, adding an extra 10-15 minutes to the covered baking time.

How should I store leftover Sweet Potato & Cranberry Gratin?

Store any leftover gratin in an airtight container in the refrigerator for up to 3-4 days. To reheat, you can warm individual portions in the microwave or place the entire dish (covered) in an oven preheated to 350°F (175°C) until heated through, about 20-30 minutes. You may need to uncover for the last 5-10 minutes to crisp the top again.

Can I make this gratin dairy-free?

Yes, you can! Substitute the heavy cream and milk with a dairy-free alternative like full-fat coconut milk (for richness) or a creamy oat milk. For the cheese, use a high-quality dairy-free grated cheese blend that melts well. The flavor profile will shift slightly but will still be delicious and comforting.

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