Fresh Herb Sweet Potato Gratin
Thinly sliced sweet potatoes layered with fresh thyme, chives, and a light garlic cream, then baked until tender with a golden top. This gratin is rich but balanced — the natural sweetness of the potatoes pairs beautifully with herbs and a subtle touch of nutmeg.
Servings 6
Calories 310kcal
Ingredients
- 2 ½ lbs sweet potatoes peeled and thinly sliced (⅛-inch thick)
- 1 cup heavy cream
- ½ cup whole milk
- 2 cloves garlic minced
- 1 tbsp fresh thyme leaves
- 1 tbsp chopped fresh chives
- ½ tsp sea salt
- ¼ tsp black pepper
- Pinch freshly grated nutmeg
- 1 cup freshly grated Gruyère or sharp white cheddar
- 1 tbsp unsalted butter for greasing dish
Instructions
- 1️⃣ Prep
- Preheat oven to 375°F (190°C).
- Butter a 9×9-inch baking dish or similar 2-quart casserole.
- 2️⃣ Infuse Cream
- In a small saucepan over low heat, warm cream, milk, garlic, thyme, salt, pepper, and nutmeg for 3–4 minutes.
- Do not boil — just gently heat to infuse flavor.
- Remove from heat.
- 3️⃣ Layer
- Arrange a layer of sweet potato slices in the dish, slightly overlapping.
- Spoon some cream mixture over the top.
- Repeat layering until all potatoes are used.
- Pour remaining cream evenly over the top.
- 4️⃣ Cover & Bake
- Cover loosely with foil.
- Bake 35–40 minutes until potatoes are tender when pierced.
- 5️⃣ Add Cheese
- Remove foil.
- Sprinkle grated cheese evenly over top.
- Bake uncovered another 15–20 minutes until golden and bubbling.
- If desired, broil 1–2 minutes for deeper browning.
- 6️⃣ Rest
- Let rest 10 minutes before serving to set layers.
Notes
📊 Approximate Nutrition (Per Serving, 1/6 dish)
Calories: ~310
Total Fat: 20 g
Saturated Fat: 12 g
Cholesterol: 65 mg
Sodium: 320 mg
Total Carbohydrates: 27 g
Sugars: 6 g
Fiber: 4 g
Protein: 9 g
(Values are estimates and may vary by ingredient brand.)
🌿 Variations
• Add thinly sliced shallots between layers
• Swap Gruyère for goat cheese for a lighter tang
• Add finely chopped rosemary for deeper herb flavor
• Top with fresh parsley before serving for brightness
• Swap Gruyère for goat cheese for a lighter tang
• Add finely chopped rosemary for deeper herb flavor
• Top with fresh parsley before serving for brightness
