French Onion Potato Bake is rich, cozy, and layered with flavor. If you love the depth of a good French onion soup and the comfort of a cheesy potato casserole, this bake brings both together in one unforgettable side dish.
Potatoes are a staple in our dinner routine. Two favorites are my Cheesy Hash Brown Potatoes and my Loaded Potato Salad Recipe. Try them, you won’t be disappointed.
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Why this French Onion Potato Bake Recipe is a Keeper
I love this recipe for easy cheesy potato bake because not only is it quick and easy, it’s also incredibly delicious. It’s a great recipe to add to a go-to dinner recipe stash.
- Intense Savory Flavor: The dry onion soup mix infuses the heavy cream and potatoes with the deep, concentrated flavor of caramelized onions and beef broth, without the hours of simmering.
- Ultimate Comfort Side: It’s a rich, creamy, and satisfying side dish that elevates any meal, particularly roasts, chicken, or steak.
- Simple Assembly: Despite the impressive final result, the dish requires minimal prep, just slicing, mixing the sauce, and layering.
- Great Textural Contrast: The potatoes cook up tender and creamy in the sauce, while the top gets a delicious golden crust from the Parmesan cheese. Feel free to add some sour cream for extra creamy sauce.
What Kind of Potatoes are Best for this Side Dish?
The best sliced potatoes to use in this comfort food recipe are Yukon gold or Russet potatoes.
Pro Tip for Baked Potato Casserole
Check for Tenderness: Before removing the foil for the final baking stage, pierce a potato slice with a fork or sharp knife. If it meets resistance, recover and bake for another 5-10 minutes before uncovering.
Ingredient Notes for this Cheesy Potato Bake
Potato recipes use easy, fresh ingredient list that pack a punch of flavor. They have everything you love, potatoes, cream and cheese.
Get the full printable recipe with specific measurements and directions in the recipe card below.
- Potatoes: Use a waxy potato variety like Yukon golds.
- Onion Soup Mix: When mixed with heavy cream, the onion soup will bring a ton of the delicious creamy flavor.
- Shredded Cheese: The recipe calls for parmesan cheese, but you could toss in a handful of shredded cheddar cheese on top or another tasty cheese.
Variations and Substitutions for Potato Casserole
Easily customize the best side dish by experimenting. Take it to the next level by using different ingredients and trying different flavors.
- Potatoes: Sweet potatoes (use 2 large), sliced rutabaga or turnip. Sweet potatoes will add a sweet/savory contrast. Root vegetables may need a slightly longer bake time.
- Dry Onion Soup Mix: 1 cup caramelized fresh onions (cooked down), 1/2 cup of French Onion Dip + 1 teaspoon beef bouillon powder. The soup mix is key for convenience; the caramelized onions require 30-40 minutes of prep.
- Grated Parmesan: Shredded Gruyere cheese, Shredded Swiss cheese, 1/4 cup blue cheese crumbles. Gruyere and Swiss are traditional for French onion soup. You an also add layers of sharp cheddar cheese for a cheesy potato casserole.
- Layering: Add 1/2 cup cooked, crumbled bacon or diced ham between the layers. Added cheese and bacon result a “loaded” element and makes it more of a main dish.
How to Make Creamy Cheesy Potato Bake
This recipe comes together in 3 quick and easy steps. These baked cheesy potatoes are so good, this recipe quickly became one of my favorites.
Get the full printable recipe with specific measurements and directions in the recipe card below.
- Preheat Oven and Prep Pan: Preheat the oven and grease the casserole dish.
- Assemble Layers: Mix together the heavy cream and the onion soup mix. In the prepared casserole dish, layer half of the potatoes then half of the onions. Pour half of the soup mixture on, then repeat the layers of potato, onion and soup mix.
- Top and Bake: Top with parmesan cheese, cover with aluminum foil and bake for 20 minutes. Then, remove the foil and bake until the potatoes are tender. Sprinkle on the chopped parsley and allow to rest before serving.
Make Ahead Suggestions to Make Potato Bake
I like to prepare ingredients ahead of time so that I don’t have to do all of the steps at once when I’m making dinner.
- The Sauce and Onions (Up to 24 hours): Slice the onion rings and mix the heavy cream and onion soup mix. Store both in separate airtight containers in the refrigerator.
- Full Assembly (Day of): Peel and slice the potatoes, assemble the entire dish in the casserole dish, and cover it tightly with foil. Do not add the Parmesan cheese yet. Refrigerate until you’re ready to bake, or up to 4 hours.
Alternate Cooking Methods for Potatoes Au Gratin
Alternatively, you can make individual servings using your air fryer.
- Individual Servings (Ramekins): Layer the potatoes, onions, and cream mixture into 4-6 individual ramekins. Bake at 400°F uncovered for 20-25 minutes, until tender and golden brown. Excellent for plating at a dinner party. Total bake time is shorter.
- Air Fryer (Small Batch): Layer the ingredients in a small, air-fryer-safe baking dish. Cook at 350°F for 20-25 minutes, covering with foil for the first 10 minutes if needed to prevent burning. Ideal for 2 servings or a very small casserole dish.
Store, Reheat and Use Scalloped Potatoes
- Store: Store cooled leftovers in the baking dish covered with foil, or transfer to an airtight container. Refrigerate for 3-4 days.The leftovers will firm up significantly as they cool.
- Reheat: Place leftovers in an oven-safe dish, cover with foil, and bake at 350°F for 15-20 minutes until heated through.
- Microwave: Microwaving to reheat is the quickest, but may result in slightly mushy potatoes. Adding a sprinkle of cheese and some thyme before oven reheating can help refresh these scalloped potatoes.
- Use Leftovers: Mash the cold leftovers, form into patties, coat in Panko, and pan-fry until golden brown and hot. This turns them into crispy, thin potato slices.
- Stuffed Omelets: Chop the leftover creamy potato bake and use it as a savory filling for an omelet or breakfast scramble.
- Beef Side: Serve cold or slightly warm alongside thinly sliced leftover roast beef (like a potatoes au gratin or potato salad).
Recipe FAQS for Cheesy Potato Bake Recipe
How thin Should the Potatoes be Sliced?
The potatoes should be sliced pretty thin. I like to slice mine to about 1/8 inch slices.
Why Cover it for the First 20 Minutes?
It’s best to cover with foil over the top for some of the cooking time so that it doesn’t dry out.
Tips for Making French Onion Casserole Recipe
It’s so easy to adapt this potato with thickened cream, garlic and onions.
- Don’t Rinse the Potatoes: After slicing, do not rinse the potatoes. The natural starch on the slices is essential for thickening the heavy cream sauce and making the final dish rich and creamy.
- Seasoning the Layers: Although the soup mix is salty, sprinkle a very light pinch of salt and pepper, garlic powder or onion powder over the potato and onion layers before adding the cream. This ensures every layer is seasoned, not just the sauce.
- Set Time is Crucial: Do not skip the 5-minute resting period after baking. This allows the sauce to finish setting and prevents it from being runny when you serve it.
- Ultimate French Onion Top: If you want a more authentic French Onion finish, substitute a 1/2 cup mix of shredded Swiss and Gruyère cheese for the Parmesan on top. Broil until bubbly and deeply golden brown
- Serve These with the Best Potato Bake: Serve with Garlic Herb Eye of Round Roast, Creamy Risotto or Peanut Butter Stuffed Cookies.
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French Onion Potato Bake
French Onion Potato Bake is an easy, layered casserole. The combination of onions, potatoes and a creamy sauce make for an irresistible weeknight meal.
Equipment
- 2-quart casserole dish
- Sharp knife or mandoline
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Ingredients
- 3 cups Yukon Gold or Russet potatoes, peeled and thinly sliced
- 1 medium Yellow onion, thinly sliced
- 1 cup Heavy cream
- 1 ounce Dry onion soup and dip mix, 1 packet
- ⅓ cup Parmesan cheese, freshly grated
- 1 tablespoon Fresh parsley, chopped, garnish
Instructions
- Preheat the oven to 400 degrees F. Lightly grease a 2-quart casserole dish.
- In a medium mixing bowl, whisk together the heavy cream and dry onion soup mix until fully combined.
- Arrange half of the sliced potatoes in an even layer in the prepared baking dish.
- Top with half of the sliced onions.
- Pour half of the cream mixture evenly over the potatoes and onions.
- Repeat the layers with the remaining potatoes, onions, and cream mixture.
- Sprinkle the Parmesan cheese evenly over the top.
- Cover tightly with aluminum foil and bake for 30 minutes.
- Remove the foil and continue baking for 15 minutes, or until the potatoes are tender when pierced with a knife and the top is lightly golden.
- Let the casserole rest for 10 minutes before serving.
- Garnish with chopped parsley.
Christina’s Notes
Slice the potatoes as evenly as possible, about ⅛ inch thick, for consistent cooking.
A mandoline makes quick work of slicing and helps create uniform layers.
If the potatoes are not fully tender after baking, cover loosely with foil and continue baking for an additional 5 to 10 minutes.
For extra flavor, substitute part of the Parmesan cheese with Gruyere or Swiss cheese.
This casserole can be assembled up to 24 hours in advance and refrigerated before baking.
Store leftovers in an airtight container in the refrigerator for up to 4 days.
Reheat covered in a 325 degree F oven until warmed through.
A mandoline makes quick work of slicing and helps create uniform layers.
If the potatoes are not fully tender after baking, cover loosely with foil and continue baking for an additional 5 to 10 minutes.
For extra flavor, substitute part of the Parmesan cheese with Gruyere or Swiss cheese.
This casserole can be assembled up to 24 hours in advance and refrigerated before baking.
Store leftovers in an airtight container in the refrigerator for up to 4 days.
Reheat covered in a 325 degree F oven until warmed through.
Helpful Tips for All RecipesThese quick tips will help you get perfect results every time.
- Scale the recipe: Simply adjust the serving size in the recipe card and the ingredients will update automatically.
- Make your own All Purpose Seasoning: When a recipe calls for All Purpose Seasoning, you can use my homemade All Purpose Seasoning recipe or substitute salt and pepper to taste.
- Meat doneness: I always use a meat thermometer to test for doneness when cooking meat.
- Use unsalted butter: I use unsalted butter so I can control the salt level in the recipe.
- Preheat the oven: Unless otherwise noted, always preheat your oven before baking.
For more helpful information about this recipe, such as variations, substitutions and other pro-tips, check out the blog post.
Nutrition
Calories: 234kcalCarbohydrates: 19gProtein: 5gFat: 16gSaturated Fat: 10gPolyunsaturated Fat: 1gMonounsaturated Fat: 4gCholesterol: 50mgSodium: 493mgPotassium: 411mgFiber: 2gSugar: 3gVitamin A: 690IUVitamin C: 17mgCalcium: 96mgIron: 1mg
The nutritional information provided are estimates. It is recommended that you verify this information with your own trusted resource.
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