Sweet Potato Cranberry Gratin

🍠 Cranberry & Sweet Potato Gratin: The Perfect Holiday Side Dish Twist! 🧀
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Are you searching for a holiday side dish that’s a little sweet, a little savory, and a whole lot comforting? Something that stands out from the traditional mashed potatoes and plain sweet potato casserole?

Look no further than this Sweet Potato & Cranberry Gratin.

This recipe takes the cozy warmth of sweet potatoes and elevates it with an irresistible, rich, creamy cheese sauce, a pop of tart dried cranberries, and a perfectly browned, bubbling gratin topping. It’s the ideal blend of sweet and savory flavors that complement everything from roast turkey to baked ham.

The beauty of a gratin is in its layers: thinly sliced sweet potatoes absorb the rich cream sauce as they bake until tender, while the dried cranberries soften and burst with tartness. The final layer of cheese and brown sugar creates a golden, caramelized crust that is absolute perfection.

Forget the marshmallow topping this year—this elegant, rustic gratin will be the star of your holiday table.

🍁 Why This Gratin is a Must-Make Holiday Tradition 🍁

This side dish is a guaranteed crowd-pleaser and a beautiful addition to any feast.

  • Sweet & Savory Balance: The earthy sweetness of the potatoes is perfectly balanced by the salty, creamy Gruyère or Parmesan and the tart cranberries.
  • Irresistible Texture: You get creamy, tender sweet potatoes, a smooth, rich sauce, and a satisfyingly crunchy, caramelized top crust.
  • Stunning Presentation: The layered slices, browned cheese, and bright red cranberries make this dish truly beautiful on the table.
  • Make-Ahead Friendly: You can assemble the entire gratin a day in advance, refrigerate it, and simply bake it before serving—a huge time-saver for busy holidays.
  • Unexpected Flavor: It offers a sophisticated twist on the classic sweet potato casserole, making it feel gourmet without requiring extra effort.

🛒 Your Gratin Ingredients

A simple list for a richly flavored dish.

  • The Base:
    • 3 large sweet potatoes (about 3 lbs), peeled and thinly sliced (about ⅛ inch thick)
    • ½ cup dried cranberries
  • The Cream Sauce:
    • 1 ½ cups heavy cream
    • 1 cup milk (whole milk preferred)
    • 2 cloves garlic, minced
    • 1 tsp fresh thyme leaves (or ½ tsp dried thyme)
    • ½ tsp salt
    • ¼ tsp black pepper
  • The Topping:
    • 1 cup Gruyère or sharp white Cheddar cheese, grated (divided)
    • 2 tbsp brown sugar, packed
    • 1 tbsp melted butter (optional, for extra browning)

🔪 Layer by Layer: Step-by-Step Instructions

This gratin is easier to assemble than it looks!

  1. Prep & Preheat: Preheat your oven to 375°F (190°C). Lightly grease a 9×13 inch casserole dish (or an 8×8 dish for a smaller, thicker portion).
  2. Slice the Sweet Potatoes: The key to a good gratin is thin, even slices. Use a mandoline slicer if you have one, or a sharp knife, aiming for about ⅛ inch thick.
  3. Make the Cream Sauce: In a medium saucepan, combine the heavy cream, milk, minced garlic, thyme, salt, and pepper. Heat over medium heat until it just begins to simmer. Remove from heat immediately. Do not boil.
  4. Assemble the Gratin:
    • First Layer: Arrange one-third of the sweet potato slices in a single, overlapping layer in the bottom of the prepared dish.
    • Middle Layer: Pour one-third of the cream sauce over the potatoes. Sprinkle with half of the dried cranberries and one-third of the grated cheese.
    • Final Layers: Repeat the layering process: potatoes, then sauce, then remaining cranberries and cheese.
    • Top Layer: For the very top, reserve the remaining one-third of the grated cheese. Arrange the final layer of potatoes and pour the last of the sauce over everything.
  5. Bake: Cover the casserole dish tightly with aluminum foil.
    • Bake for 45 minutes. The potatoes should be tender when pierced with a fork.
  6. The Golden Crust: Remove the foil. Sprinkle the remaining grated cheese over the top. In a small bowl, mix the brown sugar with the optional melted butter and sprinkle that over the cheese.
    • Return to the oven (uncovered) and bake for another 15-20 minutes, or until the top is golden brown, bubbly, and caramelized.
  7. Rest & Serve: Let the gratin rest for 10-15 minutes before serving. This allows the sauce to set up and makes serving much cleaner. Garnish with a sprig of fresh rosemary or thyme for presentation, if desired.

💡 Expert Tips for Gratin Perfection

  • Mandoline is Magic: For the quickest and most uniform slicing, a mandoline slicer is highly recommended. Thin, uniform slices are essential for even cooking.
  • The Rest is Best: Do not skip the resting time! If you slice into it immediately, the creamy sauce will run out. Giving it 10-15 minutes ensures the sauce is rich and thick when served.
  • Cheese Choice: Gruyère is a traditional and excellent choice for a creamy, nutty flavor. Sharp white Cheddar is a great substitute. Avoid pre-shredded cheese, as it contains anti-caking agents that can prevent smooth melting.
  • Make it Ahead: You can assemble the entire dish up to the point of baking, cover it tightly, and refrigerate for up to 24 hours. Add 10-15 minutes to the initial covered baking time when baking from cold.

🍽️ The Ultimate Holiday Side Awaits

The combination of tender sweet potatoes, tart cranberries, and that glorious, bubbly, cheesy, and slightly caramelized crust makes this Sweet Potato & Cranberry Gratin an unforgettable dish.

It’s the perfect blend of elegance and home-style comfort. Dig in and enjoy the compliments!

Sweet Potato & Cranberry Gratin

A rich, creamy, and elegant holiday side dish featuring thinly sliced sweet potatoes layered with tart dried cranberries and a savory Gruyère cream sauce, baked with a caramelized top crust.
Print Recipe
Prep Time 20 minutes
Cook Time 1 hour 5 minutes
Total Time 1 hour 25 minutes
Servings: 8 servings
Course: Side Dish
Cuisine: American
Calories: 350
Ingredients Equipment Method Notes

Ingredients
  

The Base
  • 3 large sweet potatoes peeled and thinly sliced (approx. ⅛ inch)
  • 0.5 cup dried cranberries
The Cream Sauce
  • 1.5 cups heavy cream
  • 1 cup milk whole milk preferred
  • 2 cloves garlic minced
  • 1 tsp fresh thyme leaves or ½ tsp dried thyme
  • 0.5 tsp salt
  • 0.25 tsp black pepper
The Topping
  • 1 cup Gruyère or sharp white Cheddar cheese grated, divided
  • 2 tbsp brown sugar packed
  • 1 tbsp melted butter optional, for topping

Equipment

  • 9×13 inch casserole dish
  • Mandoline slicer (optional)
  • Medium saucepan

Method
 

  1. Preheat oven to 375°F (190°C). Grease a 9×13 inch casserole dish.
  2. Slice sweet potatoes thinly and uniformly (approx. ⅛ inch thick).
  3. In a saucepan, combine heavy cream, milk, garlic, thyme, salt, and pepper. Heat over medium until just simmering; remove from heat.
  4. Assemble the gratin in layers: one-third potatoes, one-third cream sauce, half the cranberries, and one-third of the cheese.
  5. Repeat the layering, then top with the final layer of potatoes and the remaining sauce (reserving the final one-third of the cheese for later).
  6. Cover tightly with aluminum foil and bake for 45 minutes, or until potatoes are tender.
  7. Remove foil. Sprinkle the remaining grated cheese over the top. Mix brown sugar with melted butter and sprinkle over the cheese.
  8. Bake uncovered for another 15-20 minutes until the top is golden, bubbly, and caramelized.
  9. Let rest for 10-15 minutes before serving.

Notes

You can assemble the gratin a day ahead and refrigerate. When baking from cold, add 10-15 minutes to the initial covered baking time.

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