| Category | Details |
|---|---|
| Prep Time | 20 minutes |
| Cook Time | 55 minutes |
| Total Time | 1 hour 15 minutes |
| Servings | 6–8 as a side dish |
| Difficulty | Easy (low intensity) |
| Active Time | 20 minutes |
| Inactive/Baking Time | 55 minutes |
Intensity Breakdown
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Knife work: Medium (slicing potatoes thinly and uniformly)
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Mixing/Whisking: Low
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Assembly: Low
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Monitoring: Very low (oven does the work)
Ingredients
For the potato base:
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3 lbs (about 5–6 medium) Yukon Gold potatoes
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1 tablespoon unsalted butter (for greasing the dish)
For the cream pour-over:
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2 cups heavy cream (or half-and-half for lighter version)
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1 cup whole milk
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4 cloves garlic, thinly sliced
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1½ teaspoons kosher salt (adjust to taste)
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½ teaspoon freshly ground black pepper
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¼ teaspoon freshly grated nutmeg
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2 sprigs fresh thyme (or 1 teaspoon dried thyme)
For the topping:
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1½ cups (about 5 oz) freshly grated Gruyère cheese (or sharp white cheddar)
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½ cup freshly grated Parmesan cheese
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Fresh parsley or chives for garnish (optional)
Instructions
Step 1: Preheat and prepare
Preheat your oven to 375°F (190°C). Grease a 9×13-inch baking dish (or a 2½-quart oval gratin dish) with the 1 tablespoon of butter. Set aside.
Step 2: Slice the potatoes
Intensity: Medium — Take your time here; consistent thickness is key.
Wash and scrub the Yukon Gold potatoes well (you can peel them if you prefer, but the skin is thin and tender—I recommend leaving it on for texture and nutrition). Using a mandoline or a very sharp knife, slice the potatoes into ⅛-inch thick rounds. A mandoline is highly recommended for uniformity, which ensures even cooking. If using a knife, aim for translucent-thin slices.
Place the slices in a large bowl of cold water as you work to prevent browning and remove excess starch. Once all potatoes are sliced, drain and rinse them under cold water, then pat completely dry with clean kitchen towels. Excess water will dilute your cream sauce.
Step 3: Warm the cream pour-over
Intensity: Low
In a medium saucepan over medium heat, combine the heavy cream, whole milk, sliced garlic, kosher salt, black pepper, nutmeg, and fresh thyme sprigs. Heat until the mixture is warm and steaming but not boiling—about 3–4 minutes. You should see small bubbles forming around the edges. The goal is to infuse the cream with garlic and thyme without scalding the dairy.
Once warm, remove from heat and let it sit for 5 minutes to deepen the infusion. Remove the thyme sprigs (the leaves will have fallen off into the cream—that’s perfect) and set the cream mixture aside.
Step 4: Layer the potatoes
Intensity: Low
Arrange one layer of potato slices in the prepared baking dish, slightly overlapping them like shingles. It doesn’t need to be perfect, but try to cover the bottom completely. Sprinkle a small handful of the grated Gruyère over the potatoes (reserve about ½ cup of the Gruyère for the very top). Repeat this process—potatoes, then a sprinkle of cheese—until all potato slices are used. You should have 3–4 layers total.
Step 5: The pour-over
Intensity: Very Low (but satisfying)
Slowly and evenly pour the warm cream mixture over the layered potatoes. Use a spatula or the back of a spoon to gently press down on the potatoes so the cream can seep through all the layers. Don’t worry if some potato slices float up slightly—they’ll settle as they bake.
Sprinkle the remaining Gruyère cheese and all of the grated Parmesan evenly over the top.
Step 6: Bake
Place the dish on a rimmed baking sheet to catch any overflow (the cream can bubble up and spill over). Bake uncovered at 375°F for 45–55 minutes.
Check for doneness: The potatoes are done when they are fork-tender (insert a knife into the center—there should be no resistance) and the top is deeply golden brown and bubbling around the edges. Some edges of the potatoes may be crispy and caramelized—this is the best part.
If the top is browning too quickly before the potatoes are tender (after about 30 minutes), loosely tent with aluminum foil for the remaining baking time.
Step 7: Rest and serve
Remove from the oven and let the potatoes rest for 10–15 minutes before serving. This resting time is crucial—it allows the cream sauce to thicken and set slightly so the casserole holds its shape when you spoon it out. Garnish with fresh parsley or chives if desired.
The Last of the Recipe: Storage & Leftovers
Refrigerator: Store leftovers in an airtight container in the refrigerator for up to 4 days. The potatoes will absorb more liquid as they sit, becoming even creamier and more dense—almost like a potato pudding. To reheat, place individual portions in a microwave-safe dish and microwave on 70% power for 90 seconds to 2 minutes, or reheat in a 350°F oven covered with foil for 15–20 minutes.
Freezer: This dish freezes surprisingly well. Allow the potatoes to cool completely, then wrap the entire baking dish tightly with plastic wrap followed by a layer of aluminum foil, or transfer portions to freezer-safe containers. Freeze for up to 3 months. To serve, thaw overnight in the refrigerator, then reheat in a 350°F oven covered with foil for 20–25 minutes, removing the foil for the last 5 minutes to crisp the top.
Make-ahead tip: You can assemble the entire dish (through Step 5) up to 24 hours in advance. Cover and refrigerate. When ready to bake, add 10–15 minutes to the baking time since you’ll be starting from cold.
Nutrition Information
Per serving (based on 8 servings)
| Nutrient | Amount |
|---|---|
| Calories | 485 kcal |
| Total Fat | 34g |
| Saturated Fat | 21g |
| Trans Fat | 0g |
| Cholesterol | 115mg |
| Sodium | 520mg |
| Total Carbohydrates | 30g |
| Dietary Fiber | 3g |
| Total Sugars | 4g |
| Protein | 14g |
| Vitamin D | 1mcg (5% DV) |
| Calcium | 310mg (24% DV) |
| Iron | 1.5mg (8% DV) |
| Potassium | 890mg (19% DV) |