French Onion Baked Potatoes

Ingredients

• 4 mediumrusset potatoes
• 15 ml (1 tablespoon)olive oil
• 15 ml (1 tablespoon)unsalted butter
• 1 largesweet onion, thinly sliced
• 60 ml (1/4 cup)dry white apple vinegar
• 15 ml (1 tablespoon)fresh thyme, minced
• 240 ml (1 cup)beef broth
• 360 ml (1.5 cups)Swiss or Gruyere cheese, shredded
• to tastesalt and pepper

Instructions

1. 1

   Heat the oven

   Heat the oven to 200°C (400°F) and lightly grease a baking sheet.

2. 2

   Bake the potatoes

   Prick each potato several times with a fork. Bake for 55–60 minutes, until tender.

3. 3

   Caramelise the onions

   Warm the olive oil and butter in a frying pan over medium heat. Add the onions and cook for about 20 minutes, until caramelised.

4. 4

   Make the onion sauce

   Deglaze the pan with the apple vinegar, then stir in the thyme and beef broth. Simmer for 3–5 minutes and season with salt and pepper.

5. 5

   Fill the potatoes

   Cut open the baked potatoes and fluff their centres. Spoon in plenty of the onion mixture and top with the cheese.

6. 6

   Melt the cheese

   Return the potatoes to the oven for 15–20 minutes, until bubbly. If desired, finish under the grill for a further 2–3 minutes.

7. 7

   Cool and serve

   Leave the potatoes to cool slightly, then serve warm.

What are French onion baked potatoes?

This dish pairs the familiar baked potato with the savoury onion-and-cheese flavours of French onion soup, a classic of French cooking. Rather than serving the soup alongside, it uses the potato as a base for the onions, broth and melted cheese.

Russet potatoes make a sturdy, fluffy shell, while slowly cooked onions provide sweetness and depth. A final bake melts the cheese into the filling.

Nutrition and macros by portion

The nutrition label shows one serving as written: 430 calories, 12g protein, 54g carbs, 18g fat.

The potatoes provide most of the carbohydrates, while the cheese, olive oil and butter contribute much of the fat; the cheese and beef broth also supply some protein. To balance the plate, serve a potato with a generous portion of green vegetables or salad.

Choose the right potatoes

Russets: Their floury texture softens well in the oven and gives you a fluffy centre to loosen before filling.

Even sizing: Choose potatoes of a similar size so they are likely to become tender in roughly the same amount of time.

Give the onions time

Slow cooking: Cook the sliced onion over medium heat for about 20 minutes, stirring as needed, until it is caramelised. Rushing this stage can leave it pale and sharp rather than soft and sweet.

Deglazing: The vinegar lifts the browned flavour from the pan before the broth is added. Let the mixture simmer for 3–5 minutes so the flavours come together.

Check for doneness

Potato centres: After 55–60 minutes, a fork should slide into the potatoes easily. If they are still firm, continue baking until tender.

Cheese topping: The second bake takes 15–20 minutes; look for melted, bubbling cheese. The optional 2–3 minutes under the grill adds extra colour, so watch closely.

Build the filling

Fluff first: Open each potato and loosen its centre before adding the onion mixture, so the filling can settle into the potato rather than sit only on top.

Finish with cheese: Spread the shredded Swiss or Gruyere over the filled potatoes, then bake until bubbly.

Serve it as a meal

As a main: Pair a potato with a crisp green salad or steamed green vegetables to bring freshness to the rich, savoury filling.

As a side: These potatoes also work beside a simple roast or grilled vegetables. Serve them warm after a brief rest from the oven.

Recipe notes & tips

• Prick the potatoes before baking so steam can escape.
• Slice the onion thinly so it cooks evenly in the pan.
• Keep the onions over medium heat and allow about 20 minutes for them to caramelise.
• Fluff the potato centres before spooning in the onion mixture.
• Watch the potatoes closely if you use the grill for the final 2–3 minutes.

Variations

• Try another melting cheese: Use a similar quantity of another cheese that melts well.
• Add extra thyme: Stir a little more minced fresh thyme into the onion mixture for a stronger herbal note.
• Make it vegetarian: Replace the beef broth with vegetable broth.
• Add greens: Serve with a side of sautéed greens for a fresher plate.
• Use a sharper onion: Swap the sweet onion for a yellow onion for a more savoury onion flavour.

Common mistakes to avoid

• Undercooked potatoes: Test with a fork and keep baking until the centre is tender.
• Pale onions: Give them the full cooking time instead of turning up the heat to rush them.
• Skipping the deglaze: Add the vinegar to the pan and loosen the browned bits before pouring in the broth.
• Unfluffed centres: Loosen the potato flesh before filling so the onion mixture can settle in.
• Over-grilling: Keep an eye on the cheese during the optional grill stage, as it can brown quickly.

How to store

Refrigerate leftovers in an airtight container for up to 3 days. Reheat in an oven at 180°C until hot throughout; the microwave also works, though the potato skin will be softer.

Frequently asked questions