French Onion Potatoes Recipe

I can never resist how these French Onion Potatoes turn simple slices into a creamy, cheesy casserole packed with savory onion flavor. One scoop and it’s clear why this dish disappears fast.

I’m obsessed with French Onion Potatoes because they taste like the best parts of French onion soup crashed straight into a cheesy potato bake. The thinly sliced potatoes turn tender and loaded with savory onion flavor, while shredded cheddar cheese gets all melty and bold in every bite.

I love how rich this is without feeling fussy. But honestly, it’s the salty, creamy, cheesy bite that keeps me going back with a fork before dinner even hits the table.

No shame. And if there are browned edges involved, I’m absolutely claiming them first because that’s where the real magic is.

Ingredients

• Potatoes make it cozy and filling, like the side dish everyone quietly wants seconds of.
• Thin slices soak up all the creamy stuff, so every bite feels extra comforting.
• French onion soup mix brings that salty, savory onion kick without any fuss.
• Basically, it’s the shortcut that makes this taste like you tried harder.
• Sour cream keeps everything rich, tangy, and a little lighter than straight heavy cream.
• It also helps the potatoes turn soft and creamy instead of dry or boring.
• Cheddar cheese adds that melty top everyone picks at before dinner’s even served.
• Plus, it gives the dish a sharp, cheesy bite that keeps it from feeling flat.

Ingredient Quantities

• 6 medium potatoes, peeled and thinly sliced
• 1 packet French onion soup mix (about 1 ounce)
• 2 cups sour cream
• 2 cups shredded cheddar cheese

How to Make this

1. Preheat oven to 350°F (175°C) and grease a 9×13 inch baking dish.

2. Peel the potatoes and thinly slice them about 1/8 inch thick. Pat slices dry with a towel.

3. In a medium bowl combine the sour cream and the packet of French onion soup mix until smooth.

4. Stir in 1 cup of the shredded cheddar cheese into the sour cream mixture. Reserve the remaining cheese for the top.

5. Arrange half of the potato slices in an even layer in the prepared baking dish. Season lightly with salt and pepper if desired.

6. Spoon half of the sour cream and soup mixture over the first layer of potatoes and spread evenly.

7. Add the remaining potato slices in a second layer, then spread the remaining sour cream mixture on top. Sprinkle the reserved shredded cheddar evenly over the casserole.

8. Cover the dish tightly with foil and bake for 40 minutes. Remove the foil and bake an additional 15 to 20 minutes until potatoes are tender and the cheese is melted and lightly browned.

9. Let the casserole rest for 10 minutes before serving to allow it to set.

10. Serve hot, garnishing with chopped chives or green onions if desired.

Equipment Needed

1. 9×13 inch baking dish
2. Oven
3. Sharp chef knife
4. Cutting board
5. Mandoline or vegetable slicer (for 1/8 inch slices)
6. Medium mixing bowl
7. Rubber spatula or wooden spoon
8. Box grater (for shredding cheddar)
9. Aluminum foil
10. Kitchen towel and oven mitts

FAQ

French Onion Potatoes Recipe Substitutions and Variations

• Potatoes: use Yukon Golds for creamier texture, red potatoes for firmer slices, or thinly sliced sweet potatoes for a slightly sweet flavor
• French onion soup mix: substitute 1 ounce homemade mix of 1 tablespoon onion powder, 1 teaspoon beef bouillon granules, 1 teaspoon garlic powder, 1 teaspoon dried parsley and a pinch of sugar, or use 1 cup strong beef broth plus 1 teaspoon Worcestershire sauce
• Sour cream: swap with plain Greek yogurt for tang and protein, or use crème fraîche for richer, silkier results
• Shredded cheddar cheese: replace with Gruyere or Swiss for classic French flavor, or Monterey Jack for milder meltability

Pro Tips

1) Slice the potatoes as evenly as you can so everything cooks at the same rate. If you have a mandoline, it will save time and give perfectly uniform 1/8 inch slices. Pat the slices very dry before layering so the casserole is creamy and not watery.

2) Warm the sour cream mixture slightly before assembling to help it spread more easily between the layers and to encourage even heating. A quick 20 to 30 second zap in the microwave or a gentle whisk in a warm bowl does the trick.

3) For a silkier texture and deeper flavor, briefly parboil the sliced potatoes for 3 to 4 minutes, drain and dry them well, then proceed with layering. This short pre-cook cuts total baking time and makes the slices melt into each other beautifully.

4) If you like a crisp, golden top, remove the foil for the last 10 minutes and turn the oven to broil for 1 to 2 minutes while keeping a close eye on it so the cheese browns but does not burn. Let the casserole rest at least 10 minutes before serving so it firms up and slices cleanly.