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Creamy Pour-Over Baked Potatoes with Caramelized Onions and Parmesan


 There are few things more comforting on a chilly evening than a bubbling dish of creamy baked potatoes.

Thinly sliced potatoes are layered in a casserole dish and covered with a rich mixture of heavy cream, Parmesan, caramelized onions, and fresh thyme. As the dish bakes, the potatoes become tender and creamy while the top turns beautifully golden and bubbly.

It's somewhere between classic scalloped potatoes and a cheesy potato gratin—and it's an easy side dish that feels special enough for Sunday dinner.

Creamy Pour-Over Baked Potatoes

Servings: 6
Prep time: 25 minutes
Cook time: 60–75 minutes
Total time: About 1 hour 40 minutes

Ingredients

  • 2 tablespoons unsalted butter
  • 2 large yellow onions, thinly sliced
  • 1 teaspoon granulated sugar, optional
  • 1 tablespoon olive oil, optional
  • 2 cups heavy cream
  • 1 cup finely grated Parmesan cheese, plus 2 tablespoons for topping
  • 1½ teaspoons kosher salt, divided
  • 1 teaspoon freshly ground black pepper
  • 2 teaspoons fresh thyme leaves, chopped
  • 3 pounds russet or Yukon Gold potatoes, peeled if desired and thinly sliced
  • 1 tablespoon butter or cooking spray, for greasing the casserole dish

Instructions

1. Prepare the Oven and Baking Dish

Preheat the oven to 375°F (190°C).

Lightly grease a 9-by-13-inch glass casserole dish with butter or cooking spray and set it aside.

2. Caramelize the Onions

Melt 2 tablespoons of butter in a large skillet over medium heat.

Add the sliced onions and ½ teaspoon of the salt. Cook for about 20–25 minutes, stirring occasionally, until the onions become soft, golden brown, and sweet-smelling.

If the onions begin to stick or look dry, add a small splash of water or the optional tablespoon of olive oil.

The optional teaspoon of sugar can be added if desired, although properly caramelized onions don't require sugar.

Remove the skillet from the heat and allow the onions to cool slightly.

3. Make the Creamy Pour-Over

In a large measuring cup or bowl, whisk together:

  • Heavy cream
  • 1 cup Parmesan
  • Remaining 1 teaspoon salt
  • Black pepper
  • Fresh thyme

Stir in the caramelized onions.

This rich mixture will become the creamy sauce for the potatoes.

4. Slice the Potatoes

Slice the potatoes into rounds approximately ⅛ inch thick.

A mandoline can make it easier to produce evenly sized slices, but a sharp knife works perfectly well.

Try to keep the slices relatively uniform so they cook evenly.

5. Arrange the Potatoes

Place the sliced potatoes in the prepared casserole dish.

Arrange them in an even layer or gently overlap the slices. There's no need to make the arrangement perfect—the important thing is to distribute the potatoes evenly.

6. Pour Over the Cream Mixture

Give the cream mixture a quick stir, then slowly pour it over the potatoes.

Try to distribute the caramelized onions and thyme throughout the dish.

Gently shake the casserole dish or use a spoon to help the cream move between the potato slices.

7. Add Parmesan and Cover

Sprinkle the remaining 2 tablespoons of Parmesan over the top.

Cover the casserole tightly with aluminum foil.

8. Bake Until Tender

Place the covered casserole on the middle oven rack.

Bake for approximately 45–55 minutes, or until the potatoes in the center are tender when pierced with a knife.

9. Brown the Top

Carefully remove the foil.

Return the casserole to the oven and bake uncovered for another 15–20 minutes, or until the top is bubbling and golden brown with crisp edges.

10. Let It Rest

Remove the casserole from the oven and let it rest for at least 10 minutes before serving.

This gives the creamy sauce time to thicken slightly and makes the potatoes easier to serve.

Serve warm.

Helpful Tips

Choose the Right Potatoes

Yukon Gold potatoes produce a naturally creamy texture and hold their shape well.

Russet potatoes contain more starch and can create a thicker, softer gratin.

Either variety works well.

Slice the Potatoes Evenly

Even slices are important because very thick pieces may remain undercooked while thinner pieces become overly soft.

Aim for slices around ⅛ inch thick.

Don't Rush the Onions

Caramelized onions provide much of the dish's flavor.

Cook them slowly over medium to medium-low heat rather than trying to brown them quickly. If they begin to scorch, reduce the heat and add a small splash of water.

Let the Casserole Rest

The sauce will continue to thicken as the dish cools slightly.

Giving the potatoes about 10 minutes to rest before serving helps produce a creamier, more cohesive dish.

Easy Variations

Make It Extra Cheesy

Add ½ cup of shredded mozzarella or mild cheddar to the cream mixture for an even cheesier casserole.

Use Milk for a Lighter Version

For a somewhat lighter dish, replace 1 cup of the heavy cream with 1 cup of whole milk.

The finished casserole will be less rich but still creamy and satisfying.

Add Bacon or Ham

For a heartier version, add cooked crumbled bacon or thinly sliced cooked ham between the potato layers.

Add Mushrooms

Thinly sliced mushrooms can be added between the potatoes for extra savory flavor.

For the best texture, sauté the mushrooms first to remove excess moisture.

Change the Herbs

Fresh thyme is wonderful with potatoes and Parmesan, but rosemary, parsley, or chives can also work well.

If using dried thyme, use less because dried herbs have a more concentrated flavor.

Can You Make It Ahead?

Yes.

You can assemble the casserole, cover it tightly, and refrigerate it for up to 24 hours before baking.

Because the potatoes will be starting cold, they may require additional baking time.

For the best results, check the center carefully for tenderness before removing the casserole from the oven.

What to Serve With Creamy Baked Potatoes

These potatoes are rich enough to make a simple meal feel special, but they're especially good as a side dish.

Serve them alongside:

  • Roast chicken
  • Baked pork chops
  • Meatloaf
  • Roast beef
  • Grilled or roasted vegetables
  • Green beans
  • A crisp green salad

A simple salad with a tangy vinaigrette is particularly good because its acidity helps balance the richness of the potatoes.

Warm crusty bread is another excellent addition for soaking up the creamy sauce.

Frequently Asked Questions

Can I leave the potato skins on?

Absolutely. Yukon Gold potatoes have thin skins that can be left on. Russet skins can also be left on if you prefer a more rustic dish.

Just scrub the potatoes thoroughly before slicing.

Why are my potatoes still hard?

The slices may be too thick, or the casserole may need additional cooking time.

Make sure the dish is covered during the initial baking period so the potatoes can cook in the steam and cream.

Can I use pre-shredded Parmesan?

Freshly grated Parmesan generally melts more smoothly, but pre-shredded Parmesan can also be used.

Can I freeze the finished casserole?

Cream-based potato dishes can change texture after freezing and thawing, sometimes becoming watery or grainy.

For the best texture, refrigeration is preferable.

How should leftovers be stored?

Allow leftovers to cool and refrigerate them promptly in a covered container.

Reheat thoroughly before serving.

Final Thoughts

Creamy baked potatoes don't need complicated ingredients to taste incredible.

A few simple components—thinly sliced potatoes, rich cream, Parmesan, sweet caramelized onions, and fresh thyme—come together to create a bubbling, golden casserole that's perfect for a cozy family dinner.

The best part is how little effort is required once the dish goes into the oven.

Slice, pour, bake, and let the oven do the work.

Serve these creamy potatoes alongside your favorite roast or simply add a fresh green salad for an easy and comforting supper.