French Onion Potatoes: A Cheesy, Savory Casserole

If you love French onion soup and cheesy potato casseroles, this dish is about to become your new favorite side! French Onion Potatoes combine tender, buttery potatoes with the rich, savory flavors of French onion soup and melty gruyere cheese for a comforting, crowd-pleasing dish.

This recipe is easy to prepare and bakes to golden perfection, making it the perfect side dish for any meal. Whether you’re serving it alongside roast chicken, steak, or even a holiday feast, these potatoes will steal the show.

Let’s get started!

Ingredients You’ll Need

Here’s what you’ll need to make this cheesy, savory, and ultra-comforting potato casserole:

✔ 1 (10-oz) can French onion soup – The secret to deep, rich onion flavor.
✔ 1 (1-oz) envelope dry onion soup mix – Enhances the oniony goodness.
✔ ½ cup (1 stick) butter, melted – Adds richness and helps coat the potatoes.
✔ 2.5 lbs russet potatoes – The perfect variety for a soft, creamy texture.
✔ 2 cups shredded gruyere cheese – Melts beautifully and adds a nutty, savory finish.

Step 1: Preheat the Oven

First, preheat your oven to 375°F (190°C) so it’s ready to go when the potatoes are assembled.

Step 2: Mix the Soups and Butter

• In a large mixing bowl, combine:
  ✔ 1 can of French onion soup
  ✔ 1 packet of dry onion soup mix
  ✔ ½ cup melted butter

• Stir well until everything is fully combined. This savory, buttery mixture will coat the potatoes and infuse them with deep, rich flavor as they bake.

Step 3: Prepare the Potatoes

• Peel the russet potatoes and cut them into 1-inch cubes.
• Add the chopped potatoes directly into the soup mixture, stirring well to coat every piece evenly.

At this point, your kitchen is already smelling amazing—thanks to that rich French onion flavor blending with the butter!

Step 4: Assemble the Casserole

• Pour the potato mixture into a greased 9×13-inch baking dish.
• Spread the potatoes out evenly to ensure even cooking.

Now, it’s time to bake these savory, buttery potatoes to perfection!

In Part 1, we mixed our rich and buttery French onion sauce, coated the potatoes, and spread them into a baking dish. Now, it’s time to bake these tender, golden, and cheesy potatoes to perfection!

Step 5: Bake Covered for Even Cooking

• Cover the baking dish tightly with aluminum foil—this helps trap the steam and ensures the potatoes cook evenly and absorb all that savory French onion flavor.
• Place the dish in the preheated 375°F oven and bake for 30 minutes.

This initial baking step softens the potatoes while infusing them with the rich, buttery onion mixture.

Step 6: Uncover and Continue Baking

• After 30 minutes, remove the foil and give the potatoes a good stir to distribute the flavors evenly.
• Return the dish to the oven and bake uncovered for another 30-45 minutes, stirring 2-3 times throughout.

During this stage, the potatoes will:
✔ Develop a golden brown color.
✔ Absorb more of the savory French onion mixture.
✔ Become tender and flavorful with slightly crispy edges.

Step 7: Add the Cheese & Let It Melt

Once the potatoes are tender and golden, it’s time for the cheesy finishing touch!

• Remove the dish from the oven and sprinkle 2 cups of shredded gruyere cheese evenly over the top.
• Cover the dish with foil again and let it sit for 5-10 minutes.

This allows the cheese to melt beautifully into the potatoes without overcooking or drying them out. The result? A gooey, cheesy, and ultra-flavorful casserole!

Step 8: Serve & Enjoy!

Now that the cheese is melted and deliciously gooey, your French Onion Potatoes are ready to serve!

✔ Spoon them onto plates and enjoy warm.
✔ Garnish with fresh parsley or chives for a pop of color.
✔ Pair them with grilled steak, roasted chicken, or a holiday feast!

We’ve baked our buttery, French onion-infused potatoes until golden and tender, topped them with melty gruyere cheese, and let everything come together into the ultimate comfort food side dish. Now, let’s go over some common questions, storage tips, and fun ways to customize this dish!

FAQ: Your French Onion Potatoes Questions Answered

1. Can I make this casserole ahead of time?

Yes! If you want to prep ahead:
✔ Assemble the dish (without baking) and cover it tightly with foil. Refrigerate for up to 24 hours.
✔ When ready to bake, let it sit at room temperature for 20 minutes before placing it in the oven.
✔ Bake as directed, adding 5-10 extra minutes to the cooking time if needed.

2. How do I store leftovers?

✔ Store any leftovers in an airtight container in the refrigerator for up to 4 days.
✔ If storing in the original baking dish, cover tightly with foil or plastic wrap.

3. How do I reheat French Onion Potatoes?

✔ Oven: Cover with foil and bake at 350°F for 15-20 minutes until warmed through.
✔ Microwave: Heat in 30-second intervals, stirring occasionally.
✔ Stovetop: Reheat in a skillet over medium heat, stirring occasionally.

Pro Tip: If the potatoes seem dry when reheating, add a splash of milk or cream to bring back their creamy texture!

4. Can I use a different type of cheese?

Yes! While gruyere is the classic choice, you can also use:
✔ Swiss cheese – Similar flavor, slightly milder.
✔ Mozzarella – For extra melty, stretchy cheese.
✔ Cheddar – A sharper, bolder taste.
✔ Parmesan – A nutty, salty flavor boost (great as a topping!).

5. Can I make this dish with a different type of potato?

Absolutely! While russet potatoes are creamy and tender, you can also use:
✔ Yukon Gold potatoes – Buttery and rich.
✔ Red potatoes – Hold their shape well for a firmer texture.
✔ Baby potatoes – No need to peel, just halve or quarter them!

6. What can I serve with French Onion Potatoes?

These potatoes are super versatile and pair well with:
✔ Grilled steak or roasted chicken – A perfect match for the rich flavors.
✔ Pork chops or turkey – A great holiday side.
✔ A fresh green salad – Balances out the richness.

Final Thoughts

These French Onion Potatoes are the perfect cheesy, savory, and comforting side dish for any occasion. Whether you’re making them for a family dinner, a potluck, or a holiday feast, they’re guaranteed to be a hit!

✔ Easy to make with minimal ingredients
✔ Rich, buttery, and full of onion flavor
✔ Melty, gooey cheese on top for the perfect finishing touch

If you try this recipe, let me know how it turned out! Did you switch up the cheese? Try a different potato? Drop a comment below—I’d love to hear your take on it!

Happy cooking! 🧀🥔✨

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