If you’ve ever wished to capture the comforting, savory magic of a classic French onion soup in a cozy, family-friendly dish, you’re going to fall head over heels for this French Onion Potatoes Recipe. This recipe transforms simple sliced potatoes into a bubbling, cheesy, and creamy casserole that bursts with caramelized onion flavors and a rich cheddar topping. It’s the kind of dish that feels like a warm hug on a plate, perfect for gatherings or a comforting weeknight dinner that everyone will ask for again and again.

Ingredients You’ll Need
The beauty of the French Onion Potatoes Recipe lies in its straightforward ingredients list. Each item plays an essential role, from building the deeply savory flavor to creating a luscious texture and adding vibrant color to your dish.
- Potatoes, 6 medium-sized, peeled and thinly sliced: The base of the dish, providing a tender and hearty canvas that soaks up all the flavors beautifully.
- French onion soup mix, 1 packet: The secret to that iconic onion flavor, delivering rich, caramelized notes in a convenient form.
- Sour cream, 2 cups: Adds creaminess and a slight tang that perfectly balances the overall taste.
- Milk, 1/4 cup: Helps blend all the creamy ingredients smoothly for an even coating over the potatoes.
- Butter, 1/2 cup melted: Brings a luscious, silky mouthfeel and enhances the savory depth.
- Cheddar cheese, 2 cups shredded: Creates a golden, bubbly crust that adds rich flavor and irresistible texture.
- Salt and pepper to taste: Simple seasonings that elevate the dish and bring balance to every bite.
How to Make French Onion Potatoes Recipe
Step 1: Prepare the Oven and Baking Dish
Start by preheating your oven to 350°F (175°C) to ensure it’s hot and ready for baking. Meanwhile, take a 9×13-inch baking dish and grease it thoroughly with butter or cooking spray; this prevents sticking and gives the outer edges a slight crispness that’s delightful.
Step 2: Mix the Creamy Onion Sauce
In a large bowl, combine the sour cream, milk, melted butter, and the entire packet of French onion soup mix. Stir these ingredients together until you achieve a smooth, well-blended sauce. This mixture is the heart of your French Onion Potatoes Recipe, infusing every slice with rich, savory flavor.
Step 3: Layer the Potatoes
Arrange the thinly sliced potatoes evenly in the prepared baking dish. Creating an even layer is important so that each piece can cook uniformly and soak in the luscious sauce. Don’t rush this part; a careful layer means every bite will be perfectly tender.
Step 4: Coat Potatoes with Sauce
Pour the creamy onion sauce over the potatoes, making sure every slice is generously covered. This step ensures that the potatoes absorb maximum flavor and stay moist during cooking.
Step 5: Bake Covered
Cover the dish tightly with aluminum foil and bake for 45 minutes. This allows the potatoes to cook through gently while the sauce thickens and melds with all the layers.
Step 6: Add Cheese and Finish Baking
After removing the foil, sprinkle the shredded cheddar cheese evenly over the top. Return the dish to the oven for an additional 15 minutes, uncovered, until the cheese turns golden and bubbly, adding the perfect finishing touch of richness and texture.
Step 7: Serve and Enjoy
Your French Onion Potatoes are now ready to serve hot and fresh from the oven. Gather your loved ones and watch this dish disappear quickly—its comforting layers and cheesy goodness make it impossible to resist.
How to Serve French Onion Potatoes Recipe
Garnishes
Adding a sprinkle of fresh chopped parsley or chives not only brightens the dish visually but adds a subtle fresh flavor that contrasts with the creamy, cheesy richness. For a spicy kick, a pinch of smoked paprika on top can deepen the flavor profile beautifully.
Side Dishes
This dish pairs wonderfully with fresh green salads, sautéed green beans, or roasted Brussels sprouts. Consider serving it alongside a simple grilled chicken breast or a tender pork chop to round out a satisfying meal that feels both homely and special.
Creative Ways to Present
For a fun twist, try dividing the French Onion Potatoes Recipe into individual ramekins for personal servings. You can also serve it as a hearty side in a Dutch baby or alongside crusty artisan bread to scoop up every bit of the cheesy sauce. Presentation matters and these ideas add a bit of extra flair to your comforting classic.
Make Ahead and Storage
Storing Leftovers
After your meal, simply cover any leftovers tightly with plastic wrap or transfer them to an airtight container. Stored in the refrigerator, the French Onion Potatoes will stay delicious for up to 3 days and make for an easy, tasty meal the next day.
Freezing
If you want to enjoy this dish at a later date, it freezes well when wrapped securely. It’s best to freeze it before adding the cheese topping, then thaw and add fresh cheese before baking. This method keeps the dish tasting fresh and creamy when reheated.
Reheating
Reheat your French Onion Potatoes gently in a 350°F oven, covered with foil to prevent drying out, for about 20 minutes or until warmed through. This retains all the textures and flavors just as beautifully as the first time you enjoyed it.
FAQs
Can I use a different type of cheese?
Absolutely! While cheddar is traditional and melts beautifully, Gruyère, mozzarella, or a blend of your favorite cheeses can offer delightful variations especially if you’re seeking a milder or creamier texture.
Do I have to peel the potatoes?
Peeling helps create a creamier texture and more elegant look, but if you prefer the rustic feel and extra nutrients, leaving the skins on works fine, especially with thinly sliced potatoes.
Is there a way to make this recipe vegetarian or vegan?
For a vegetarian version, the recipe as is usually fits those needs, but for a vegan option, use plant-based sour cream, butter alternatives, and vegan cheese. Be sure the French onion soup mix is free from animal-based ingredients.
How thin should the potato slices be?
Aim for about 1/8 inch thick slices. Thin slices cook evenly and absorb all the flavors without becoming too mushy or underdone.
Can I prepare this recipe in advance for a party?
Yes! Assemble the dish a few hours ahead, keep it refrigerated, then bake it shortly before serving. This makes entertaining stress-free and ensures your French Onion Potatoes Recipe is hot and fresh for guests.
Final Thoughts
There’s just something magical about this French Onion Potatoes Recipe that turns humble ingredients into a dish bursting with flavor and comfort. Whether you’re feeding a crowd or looking for a soulful side dish, this recipe delivers joy in every creamy, cheesy bite. I can’t wait for you to make it a new family favorite and enjoy all the warmth it brings to your table!
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French Onion Potatoes Recipe
- Prep Time: 20 minutes
- Cook Time: 1 hour
- Total Time: 1 hour 20 minutes
- Yield: 8 servings
- Category: Side Dish
- Method: Baking
- Cuisine: American
Description
French Onion Potatoes is a creamy, cheesy casserole featuring thinly sliced potatoes baked with a luscious sour cream and French onion soup mix sauce, topped with melted cheddar cheese for a comforting and flavorful side dish perfect for any occasion.
Ingredients
Potatoes
- 6 medium-sized potatoes, peeled and thinly sliced
Sauce
- 1 packet French onion soup mix (approximately 1 oz)
- 2 cups sour cream
- 1/4 cup milk
- 1/2 cup butter, melted
Topping
- 2 cups shredded cheddar cheese
- Salt and pepper to taste
Instructions
- Preheat Oven: Preheat your oven to 350°F (175°C) to prepare for baking the dish.
- Prepare Baking Dish: Grease a 9×13-inch baking dish with butter or cooking spray to prevent sticking.
- Mix Sauce: In a large mixing bowl, combine the sour cream, milk, melted butter, and French onion soup mix; stir thoroughly until well blended and smooth.
- Layer Potatoes: Arrange the thinly sliced potatoes evenly in the prepared baking dish, distributing them in a single layer for even cooking.
- Add Sauce Over Potatoes: Pour the creamy mixture over the potatoes, making sure each slice is well coated to infuse flavor throughout the casserole.
- Bake Covered: Cover the dish with aluminum foil and bake in the preheated oven for 45 minutes to allow the potatoes to soften and absorb the sauce.
- Add Cheese and Finish Baking: Remove the foil carefully, sprinkle the shredded cheddar cheese evenly over the top, then bake uncovered for an additional 15 minutes until the cheese melts and develops a golden-brown crust.
- Serve: Remove from oven and serve hot for a deliciously creamy and cheesy potato side dish.
Notes
- For extra flavor, consider adding sautéed onions or garlic to the sauce mixture before baking.
- Use a mandoline slicer to ensure uniform potato slices for even cooking.
- To reduce calories, substitute sour cream with Greek yogurt and use reduced-fat cheddar cheese.
- Covering with foil during the first bake prevents the cheese from burning and helps cook the potatoes through.
- This dish pairs well with roasted meats or a fresh green salad.

