French Onion Potato Bake

Highlighted under: Comfort Food

This French Onion Potato Bake is the ultimate comfort dish for your Thanksgiving feast. Layers of creamy, cheesy potatoes meld with the rich flavors of caramelized onions, creating a warm and hearty side that will wow your guests. Perfectly baked to golden perfection, this stunning casserole is a unique twist on traditional au gratin potatoes. It's an ideal complement to turkey and stuffing, ensuring a deliciously memorable holiday meal.

Ariana Brooks

Created by

Ariana Brooks

Last updated on 2025-12-01T10:47:33.890Z

Discover the delight of French Onion Potato Bake, a dish that combines the best of creamy potatoes and sweet, caramelized onions.

A Perfect Holiday Side Dish

As the holidays approach, the search for the perfect side dish for your Thanksgiving feast becomes paramount. The French Onion Potato Bake stands out as a dazzling option that complements the traditional turkey and stuffing. The creamy layers of potatoes infused with the deep, sweet notes of caramelized onions create a rich and satisfying experience. This dish doesn’t just meet expectations; it exceeds them, elevating any holiday table with its gourmet touch.

Unlike standard potato dishes, this recipe features a delightful combination of Gruyère and Parmesan cheeses that adds a savory depth. The creamy texture, combined with a crispy, golden topping, ensures every bite is both comforting and indulgent. When preparing for a large gathering, this dish is not only crowd-pleasing but also presents beautifully, making it a memorable addition to your dining experience.

Tips for Success

To ensure your French Onion Potato Bake turns out perfectly, begin with high-quality ingredients. Select firm, fresh potatoes, as their texture is key to achieving that perfect bake. Yukon Gold or Russet potatoes are excellent choices, as they hold up well under the creamy layers. Additionally, caramelizing your onions slowly allows their natural sweetness to develop, enhancing the dish's overall flavor profile.

As you layer the ingredients, don't rush. Take your time to arrange the potatoes and onions evenly. This promotes even cooking and guarantees that every portion receives the right amount of cheese and cream. To boost the flavors, consider adding a pinch of nutmeg or a splash of white wine to the cream mixture, which will infuse an extra layer of warmth and richness.

Make-Ahead Possibilities

This French Onion Potato Bake is an excellent candidate for make-ahead meals. You can prepare the layers earlier in the day, or even the day before, and store them in the refrigerator until you're ready to bake. This not only saves you time on the big day but also allows the flavors to meld, making the dish even more delicious when it's finally baked.

If you're short on oven space during the holidays, consider par-baking your casserole. Bake it until it’s nearly done, then remove it from the oven and let it cool. When it's time to serve, simply put it back in the oven for a few minutes to finish cooking. This method keeps your dish hot and ensures a creamy, cheesy interior with a beautifully browned crust.

Ingredients

Gather all the necessary ingredients for this delicious bake.

Ingredients

  • 2 lbs potatoes, thinly sliced
  • 2 large onions, caramelized
  • 2 cups heavy cream
  • 1 cup grated Gruyère cheese
  • 1 cup grated Parmesan cheese
  • 3 cloves garlic, minced
  • 2 tbsp fresh thyme, chopped
  • Salt and pepper to taste
  • 2 tbsp butter, for greasing

Make sure all ingredients are prepared before starting the assembly.

Instructions

Follow these steps to create your French Onion Potato Bake.

Preheat the Oven

Preheat your oven to 400°F (200°C) and grease a baking dish with butter.

Layer the Ingredients

In the greased dish, layer half the sliced potatoes, half the caramelized onions, and sprinkle with half the Gruyère cheese. Repeat the layers.

Prepare the Cream Mixture

In a bowl, mix the heavy cream, garlic, thyme, salt, and pepper. Pour the mixture evenly over the layered potatoes.

Top with Cheese

Sprinkle the remaining Gruyère and all of the Parmesan cheese on top.

Bake

Cover the dish with aluminum foil and bake for 45 minutes. Remove the foil and bake for an additional 15 minutes until the top is golden brown.

Serve

Let it cool for a few minutes before serving. Enjoy your dish as a perfect side!

Once baked, let the dish cool slightly before serving to allow the flavors to set.

Serving Suggestions

French Onion Potato Bake pairs beautifully with a variety of main dishes beyond turkey. Consider serving it alongside roasted chicken or a festive ham for a wonderful flavor combination. Its rich texture and savory notes also complement a vegetarian feast, making it a versatile addition that caters to different dietary preferences.

For a well-rounded meal, add a fresh salad with tangy vinaigrette or sautéed green vegetables to your table. The brightness and crunch from these sides can create a lovely balance to the richness of the bake, making your holiday meal more enjoyable and satisfying.

Storage and Reheating

If you have leftovers (though unlikely!), you can store them in an airtight container in the refrigerator for up to three days. Reheating is simple; just pop it in the oven at a low temperature until warmed through. For the best results, cover it with foil to prevent the top from browning too quickly, ensuring that every bite remains flavorful and creamy.

This dish can also be frozen, but for best texture, it’s recommended to do so before baking. Wrap it tightly in plastic wrap and foil to prevent freezer burn, and reheat from frozen when you're ready for a cozy meal. Plan ahead, and you'll always have a delicious side dish ready to go during the busy holiday season.

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Questions About Recipes

→ Can I prepare this dish in advance?

Yes, you can assemble the dish a day ahead and keep it in the refrigerator. Just bake it right before serving.

→ What can I substitute for Gruyère cheese?

You can substitute Gruyère with Swiss cheese or a blend of mozzarella and cheddar.

French Onion Potato Bake

This French Onion Potato Bake is the ultimate comfort dish for your Thanksgiving feast. Layers of creamy, cheesy potatoes meld with the rich flavors of caramelized onions, creating a warm and hearty side that will wow your guests. Perfectly baked to golden perfection, this stunning casserole is a unique twist on traditional au gratin potatoes. It's an ideal complement to turkey and stuffing, ensuring a deliciously memorable holiday meal.

Prep Time20.0
Cooking Duration60.0
Overall Time80.0

Created by: Ariana Brooks

Recipe Type: Comfort Food

Skill Level: Intermediate

Final Quantity: 8.0

What You'll Need

Ingredients

  1. 2 lbs potatoes, thinly sliced
  2. 2 large onions, caramelized
  3. 2 cups heavy cream
  4. 1 cup grated Gruyère cheese
  5. 1 cup grated Parmesan cheese
  6. 3 cloves garlic, minced
  7. 2 tbsp fresh thyme, chopped
  8. Salt and pepper to taste
  9. 2 tbsp butter, for greasing

How-To Steps

Step 01

Preheat your oven to 400°F (200°C) and grease a baking dish with butter.

Step 02

In the greased dish, layer half the sliced potatoes, half the caramelized onions, and sprinkle with half the Gruyère cheese. Repeat the layers.

Step 03

In a bowl, mix the heavy cream, garlic, thyme, salt, and pepper. Pour the mixture evenly over the layered potatoes.

Step 04

Sprinkle the remaining Gruyère and all of the Parmesan cheese on top.

Step 05

Cover the dish with aluminum foil and bake for 45 minutes. Remove the foil and bake for an additional 15 minutes until the top is golden brown.

Step 06

Let it cool for a few minutes before serving. Enjoy your dish as a perfect side!

Nutritional Breakdown (Per Serving)

  • Total Fat: 20g
  • Saturated Fat: 12g
  • Cholesterol: 60mg
  • Sodium: 350mg
  • Carbohydrates: 30g
  • Fiber: 3g
  • Sugar: 2g
  • Protein: 8g