Who could resist the enchanting aroma wafting through the kitchen as sweet potatoes and cranberries embrace each other in a creamy casserole? This Sweet Potato & Cranberry Gratin isn’t just a holiday classic; it’s a celebration on a plate! With its vibrant colors and deliciously contrasting flavors, this dish not only elevates your festive gatherings but also allows you to whip up a stunning side with minimal fuss. Imagine impressing your guests while ensuring a gathering that’s vegetarian-friendly, gluten-free, and even offers vegan options! It’s the perfect balance of nourishment and indulgence, inviting second helpings from even the pickiest eaters. Are you ready to add a touch of festive magic to your table? Let’s dive into the details!

Why is Sweet Potato & Cranberry Gratin Irresistible?
Comforting, creamy texture: The combination of sweet potatoes and cranberries creates a luscious harmony that pleases every palate.
Festive flavors: This dish brings the essence of the holidays right to your table, making it a stunning centerpiece.
Customizable: Whether you’re vegan, gluten-free, or just looking to switch up your cheese, this gratin adapts easily with simple swaps, like using coconut cream or mozzarella.
Easy preparation: With straightforward steps, you’ll impress your guests without spending hours in the kitchen.
Crowd-pleaser: Perfect for family gatherings or potlucks, this dish guarantees seconds—likely even thirds! You won’t find any leftovers with this recipe delightfully filling your dining table.
Sweet Potato & Cranberry Gratin Ingredients
For the Gratin
- Sweet Potatoes – These provide natural sweetness and structure; butternut squash is a delicious alternative.
- Fresh Cranberries – Their tartness perfectly balances the dish; you can substitute with thawed and drained frozen cranberries.
- Heavy Cream – Adds luxurious richness; swap it with coconut cream for a delightful vegan twist.
- Brown Sugar – Enhances sweetness; try maple syrup for a natural alternative.
- Cinnamon – This warm spice elevates the flavor profile beautifully; no substitutions needed!
- Salt – Essential for balancing flavors; use sea salt for a gourmet touch.
- Pepper – A pinch adds depth; freshly cracked black pepper works best.
- Gruyère Cheese – Melts perfectly and adds a creamy texture; use cheddar, mozzarella, or feta if needed.
- Breadcrumbs – For a crispy topping; substitute with crushed gluten-free crackers or ground nuts for a gluten-free version.
Expert Tips
- Ensure sweet potatoes are fully tender before layering for optimal baking.
- Keep an eye on the gratin toward the end of baking to prevent burning.
This Sweet Potato & Cranberry Gratin is all about balancing flavors and textures, ensuring it’s a hit at any gathering. Now, let’s dig into how to prepare this festive delight!
Step‑by‑Step Instructions for Sweet Potato & Cranberry Gratin
Step 1: Preheat the Oven
Begin by preheating your oven to 375°F (190°C). A hot oven is essential to achieving that golden, crispy top for your Sweet Potato & Cranberry Gratin. While the oven warms up, you can get started on prepping the sweet potatoes.
Step 2: Prepare the Sweet Potatoes
Peel and slice the sweet potatoes into thin rounds, about 1/4 inch thick. Place them in a large pot of salted water and bring to a boil. Cook for 10-15 minutes until they are tender but not falling apart. Drain the potatoes well and set them aside to cool slightly.
Step 3: First Layering
In a greased baking dish, layer half of the cooked sweet potato slices, creating a slightly overlapping pattern to ensure even coverage. The vibrant orange will look beautiful against the dish’s warm interior. Now it’s time to add the cranberries for a burst of tartness.
Step 4: Add Cranberries
Sprinkle half of the fresh cranberries evenly over the first layer of sweet potatoes. Their bright color and tangy flavor will accentuate the sweetness of the potatoes, making this Sweet Potato & Cranberry Gratin truly festive.
Step 5: Cream Mixture
In a separate bowl, whisk together the heavy cream, brown sugar, cinnamon, salt, and pepper until well combined. This will create a rich sauce that ties the gratin together beautifully. Pour half of this scrumptious mixture over the layered vegetables, ensuring even coverage.
Step 6: Second Layering
Repeat the layering process with the remaining sweet potato slices and cranberries. Make sure to arrange the sweet potatoes in a similar overlapping manner as before. Pour the rest of the cream mixture over the top, allowing it to seep through to the layers below.
Step 7: Topping it Off
Finish off your Sweet Potato & Cranberry Gratin by generously sprinkling the shredded Gruyère cheese and breadcrumbs on top. This combination will create a delightful crispy, golden crust as it bakes. Make sure to cover all the layers so every bite is deliciously cheesy.
Step 8: Bake to Perfection
Place the baking dish in the preheated oven and bake for 30-35 minutes. Keep an eye on it as it cooks, looking for a golden-brown top and bubbly edges—these are your indicators that your gratin is ready.
Step 9: Cool and Serve
Once golden and bubbly, remove the gratin from the oven and let it cool for a few minutes. This resting time allows the layers to set, making it easier to slice. Serve your Sweet Potato & Cranberry Gratin warm and enjoy the comforting combination of flavors!

Make Ahead Options
These Sweet Potato & Cranberry Gratin are a fantastic meal prep option for busy cooks! You can peel and slice the sweet potatoes, as well as prepare the cream mixture, up to 24 hours in advance. Store the sweet potatoes in a bowl of cold water in the refrigerator to prevent browning. When you’re ready to assemble, layer the prepped sweet potatoes and cranberries in the baking dish, pouring the cream mixture over top just before baking. For optimal results, it’s best to bake the gratin on the same day, which will give you a beautifully golden, bubbling dish that’s just as delicious as if freshly made!
Sweet Potato & Cranberry Gratin Variations
Feel free to explore these delightful variations and make this recipe truly your own!
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Vegan Option: Swap heavy cream with coconut cream for a creamy vegan delight. This adds a tropical twist and keeps the richness intact.
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Cheese Swap: Use cheddar or feta cheese instead of Gruyère for a unique flavor profile. Each cheese will add its distinct character to the dish.
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Spice It Up: Add a pinch of nutmeg or ginger for an extra layer of warmth. This can elevate the festive experience with a hint of holiday spices.
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Nutty Crunch: Replace breadcrumbs with crushed nuts for a nutty topping. Almonds or pecans add a delightful crunch, contrasting beautifully with the creamy interior.
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Herb Infusion: Mix in some fresh herbs like thyme or rosemary in the cream mixture. The herbaceous notes will complement the sweetness perfectly.
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Mixed Berries: Combine cranberries with other berries like blueberries or raspberries for a mixed berry version. This adds vibrant color and a medley of tartness to each bite.
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Sweetness Adjustment: Switch brown sugar for agave syrup or honey as a sweetener. This will provide a different sweetness level while keeping it delightful.
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Lower Carb: Substitute sweet potatoes for cauliflower for a lower-carb alternative. Just steam the cauliflower before layering for a lighter take on this dish.
Whether you’re craving a nutty crunch or seeking to elevate the flavors with fresh herbs, the possibilities are endless. These suggestions ensure your Sweet Potato & Cranberry Gratin remains a festive favorite! And if you love perfect sides, don’t miss trying Sausage Sweet Potatoes or Coconut Shrimp Sweet. They will surely join your table for delightful gatherings!
What to Serve with Sweet Potato & Cranberry Gratin
Transform your holiday table into a feast of flavors with delightful accompaniments that elevate your dining experience.
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Roasted Turkey: The savory, juicy goodness of roasted turkey pairs beautifully with the sweet and tart gratin, making it a classic holiday favorite.
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Garlic Mashed Potatoes: Creamy mashed potatoes infused with garlic provide a velvety contrast to the gratin’s crispy top, making for a cozy comfort meal.
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Honey-Glazed Carrots: Their natural sweetness harmonizes with the cranberries, adding vibrant color and a fresh crunch to your plate.
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Sautéed Green Beans: These tender yet crisp veggies introduce a burst of freshness, balancing out the rich flavors of the gratin and meat.
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Cranberry Sauce: A dollop of homemade cranberry sauce enhances the tart flavor profile, making each bite of gratin even more delightful.
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Sparkling Cider: A refreshing glass of sparkling cider is a festive non-alcoholic option that complements the dish’s sweetness and brightens your table.
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Pumpkin Pie: End your meal on a sweet note with a slice of pumpkin pie, creating a beautifully seasonal finish that guests will adore.
Expert Tips for Sweet Potato & Cranberry Gratin
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Layer Smartly: Make sure to overlap sweet potato slices slightly for even cooking. This ensures every bite is infused with flavor.
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Cream Consistency: If using non-dairy alternatives like coconut cream, make sure it’s smooth and well-blended for a rich texture in your Sweet Potato & Cranberry Gratin.
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Check for Doneness: Keep an eye on the gratin in the last 10 minutes of baking to avoid burning. A golden top is ideal, but it can quickly turn dark!
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Cooling Time: Allow your gratin to cool for about 5 minutes after baking. This step helps it set, making slicing easier and neater.
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Serving Suggestions: For a festive touch, garnish with fresh herbs like rosemary or parsley before serving, adding color and flavor to your delightful dish.
How to Store and Freeze Sweet Potato & Cranberry Gratin
Fridge: Store any leftovers in an airtight container for up to 3 days. Reheat in the oven to maintain crispiness and texture.
Freezer: You can freeze the unbaked Sweet Potato & Cranberry Gratin for up to 2 months. Cover tightly with foil or plastic wrap to prevent freezer burn.
Reheating: To reheat, thaw overnight in the fridge, then bake at 375°F (190°C) for 20-25 minutes until heated through.
Make-Ahead Tip: Assemble the gratin a day in advance and keep it covered in the fridge. Bake just before serving for a freshly made taste.

Sweet Potato & Cranberry Gratin Recipe FAQs
How do I choose the right sweet potatoes?
Absolutely! When selecting sweet potatoes, look for ones that are firm and free of blemishes or dark spots. The skin should be smooth, and they should feel heavy for their size. Avoid any that are sprouting or soft to the touch, as these may be past their prime.
What is the best way to store leftover Sweet Potato & Cranberry Gratin?
Very easy! You can store any leftovers in an airtight container in the fridge for up to 3 days. When ready to enjoy, reheat in the oven at 350°F (175°C) for about 15-20 minutes to retain that crispy topping and warm, creamy interior.
Can I freeze Sweet Potato & Cranberry Gratin?
Absolutely! You can freeze the unbaked Sweet Potato & Cranberry Gratin for up to 2 months. Just cover it tightly with foil or plastic wrap to prevent freezer burn. When you’re ready to bake, let it thaw overnight in the fridge, then bake as directed. It may take an additional 5-10 minutes to cook thoroughly, so keep a close eye on it!
I’m vegan; how can I modify this recipe?
Great question! For a vegan version of Sweet Potato & Cranberry Gratin, simply replace the heavy cream with coconut cream or a plant-based cream alternative. Also, ensure you select a vegan cheese substitute if you like, or you can skip the cheese altogether. The creaminess of the sweet potatoes will still shine through!
Why is my gratin watery?
If your Sweet Potato & Cranberry Gratin ends up watery, it may be due to undercooked sweet potatoes or excess moisture from the cranberries. Make sure to cook the sweet potatoes until they are tender but not mushy before layering. You can also try draining any excess liquid from the cranberries if using frozen ones. Lastly, a longer baking time can help evaporate excess moisture, giving you that perfect creamy texture!
Can I make this dish a day ahead of time?
Absolutely! You can assemble the Sweet Potato & Cranberry Gratin a day in advance. Just cover it tightly with plastic wrap and store it in the fridge. When you’re ready to serve, pop it in the oven and bake before your guests arrive for a freshly baked serving that they’ll love!

Sweet Potato & Cranberry Gratin for Cozy Gatherings
Ingredients
Equipment
Method
- Preheat your oven to 375°F (190°C).

- Peel and slice the sweet potatoes into thin rounds, about 1/4 inch thick. Cook in a large pot of salted water for 10-15 minutes until tender.

- In a greased baking dish, layer half of the cooked sweet potato slices.

- Sprinkle half of the cranberries over the first layer of sweet potatoes.

- Whisk together the heavy cream, brown sugar, cinnamon, salt, and pepper. Pour half of this mixture over the layered vegetables.

- Repeat layering with remaining sweet potato slices and cranberries, then pour the rest of the cream mixture on top.

- Sprinkle the shredded Gruyère cheese and breadcrumbs on top.

- Bake for 30-35 minutes until golden and bubbly.

- Let it cool for a few minutes before serving.


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