Potato, carrot and onion in a casserole: a simple but comforting recipe!

I make this casserole when I want a very simple but really comforting dish. Three everyday vegetables — potato, carrot, onion — and yet, with gentle cooking and good seasoning, you get something very "homemade": meltingly tender, fragrant, and above all not dry.

I developed it one evening when I wanted a side dish that could also stand on its own with a fried egg, a little ham, or even a well-dressed green salad

The secret is to take the time to sweat the onions in butter (they become almost caramelized), then let the vegetables simmer covered with just a little stock. They cook, they absorb the flavors, and they bind together naturally thanks to the starch from the potatoes.

From a nutritional standpoint, it's a fairly balanced dish: fiber, potassium, beta-carotene from the carrots… and a reasonable amount of fat if you use butter sparingly. The thyme and bay leaf provide that classic vegetable stew flavor without making things complicated.

You can easily adapt the recipe: more or less broth depending on whether you like it "dry" or a little juicy, a mild mustard added at the end of cooking to enhance the flavor, or a handful of parsley for freshness.

But the basics remain the same: a casserole dish, mild weather, and well-prepared vegetables.

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Potato, carrot and onion in a casserole

Recipe by Nathalie Laplace

5.0 based on 1 vote(s)

Type of dish: accompaniementKitchen: FrenchDifficulty: easy

Portions

4

people

Preparation

17

minutes

Cooking

35

minutes

Calories

269

kcal

Total time

52

minutes

A casserole recipe : meltingly tender potatoes, gently sweet carrots, and caramelized onions. All simmered in butter with a light stock, just enough to bind and flavor.

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Ingredients

• 800g of peeled potatoes (Charlotte or Yukon Gold type)

• 350g of peeled carrots

• 2 large yellow onions (approx. 150g each), peeled

• 30g of butter

• 1 tablespoon of neutral oil (sunflower or rapeseed)

• 250 ml of vegetable (or chicken) stock

• 1 bay leaf

• 2 sprigs of thyme (or 1/4 teaspoon of dried thyme to replace one sprig)

• 1 tablespoon of chopped flat-leaf parsley (optional)

• 1 teaspoon of fine salt (adjust as needed)

• 1/2 teaspoon of ground black pepper

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Preparation steps

• Cut the potatoes into large cubes of 2.5–3cm. Cut the carrots into slightly thick slices (about 8mm). Slice the onions into half-slices.
• Heat a casserole dish over medium heat. Add the butter and oil. When the butter foams, add the onions with a small pinch of salt.
• Sweat the onions for 8 minutes, stirring often: they should become soft and translucent, without browning too much. If they start to stick, lower the heat slightly.
• Add the carrots, mix, then cook for 4 minutes to coat them in fat and begin to soften them.
• Add the potatoes. Season with salt and pepper, then add the thyme and bay leaf. Mix for 1 minute to distribute the herbs evenly.
• Pour in the broth. Scrape the bottom of the pot with a wooden spoon to loosen the juices (that's where the flavor is hidden).
• Cover and simmer over low heat for 18 minutes. Stir once halfway through cooking, gently so as not to break the potatoes.
• Remove the lid and continue cooking for 5 minutes over medium-low heat to reduce the liquid and thicken slightly. The potatoes should be very soft, the carrots tender, and there should be just enough broth to coat the bottom of the pot.
• Taste and adjust the salt and pepper. Remove the bay leaf and thyme sprigs. Off the heat, add the parsley if using, then serve piping hot.

📊 Nutritional Information

1 serving (approx. 360g)

* RDA = Recommended Daily Allowance

📝 Notes

If you are serving this recipe as a main course, I like to add a fried egg per person and a dash of vinegar on a small green salad on the side: the acidity awakens the melt-in-your-mouth texture of the casserole.

💡 Chef's Tips

For a melt-in-your-mouth casserole without mush, keep the vegetables fairly large and stir gently. If your potatoes absorb all the liquid before the end, add 2–3 tablespoons of hot water or stock, no more.

🔄 Variations

• For a more rustic version: add 1 chopped garlic clove along with the carrots.
• For a spicier version: add 1 teaspoon of mild mustard off the heat, just before serving.

Nathalie Laplace

Food writer for the Simple & Bon website. Passionate about healthy cooking and especially salads, slow-cooked or oven-baked recipes.