Effortless 4-Ingredient French Onion

Featured in: Fresh Everyday Bowls

This comforting French dish features slowly caramelized onions cooked until golden and rich in flavor. The onions simmer in a savory broth before being ladled into bowls, topped with crusty bread slices and grated Gruyère cheese. A quick broil melts the cheese to bubbly perfection, creating an elegant, easy-to-make soup that balances sweet and savory tastes. Ideal as a warming meal, it pairs wonderfully with light wines or ciders, and allows easy substitutions for a vegetarian or vegan variation.

Updated on Wed, 26 Nov 2025 13:24:56 GMT
Golden-brown, bubbly 4-Ingredient French Onion Soup, crowned with melted Gruyère on crusty bread. Save to Pinterest
Golden-brown, bubbly 4-Ingredient French Onion Soup, crowned with melted Gruyère on crusty bread. | citrushearth.com

Effortless 4-Ingredient French Onion Soup A classic French comfort dish made simple&caramelized onions simmered in rich broth, topped with crusty bread and melted cheese. Elegant, flavorful, and budget-friendly.

This soup has become a family favorite during chilly evenings as it warms the soul and satisfies appetites with minimal ingredients.

Ingredients

  • Vegetables: 1.5 kg yellow onions, thinly sliced
  • Dairy: 150 g Gruyère cheese, grated
  • Bread: 6 thick slices of baguette or rustic bread
  • Broth: 2 liters beef or vegetable broth (low-sodium recommended)

Instructions

Step 1:
In a large heavy-bottomed pot over medium-low heat, add sliced onions. Cook, stirring often, until deep golden brown and caramelized, about 30 35 minutes. (If onions start sticking, add a splash of broth or water.)
Step 2:
Pour in the broth, bring to a gentle simmer, and cook uncovered for another 15 minutes. Season with salt and freshly ground black pepper to taste.
Step 3:
Preheat your oven to 200°C (400°F) or set your broiler to high.
Step 4:
Ladle the hot soup into ovenproof bowls. Place a slice of bread on top of each, then sprinkle generously with Gruyère cheese.
Step 5:
Place bowls on a baking sheet and broil for 5 7 minutes, or until the cheese is bubbling and golden.
Step 6:
Serve immediately, being cautious as bowls will be hot.
Aromatic, savory 4-Ingredient French Onion Soup: caramelized onions swimming in rich broth, ready to enjoy. Save to Pinterest
Aromatic, savory 4-Ingredient French Onion Soup: caramelized onions swimming in rich broth, ready to enjoy. | citrushearth.com

This recipe brings everyone together at our table, often sparking stories and laughter around the warmth of the soup.

Notes

Add a splash of white wine with the broth for extra depth. Pairs beautifully with a crisp Sauvignon Blanc or dry cider.

Required Tools

Large heavy-bottomed pot Sharp knife Ovenproof soup bowls Baking sheet Cheese grater

Allergen Information

Contains Gluten (bread) Milk (cheese). For gluten-free, use certified gluten-free bread. For dairy-free, use plant-based cheese.

Warm, cheesy bowls of delicious 4-Ingredient French Onion Soup, ideal for a cozy, comforting meal. Save to Pinterest
Warm, cheesy bowls of delicious 4-Ingredient French Onion Soup, ideal for a cozy, comforting meal. | citrushearth.com

This simple recipe is sure to become a staple in your kitchen and comfort food rotation.

Recipe FAQs

How do you caramelize onions properly?

Cook sliced onions slowly over medium-low heat, stirring frequently, until they turn deep golden brown and sweet, usually about 30-35 minutes.

Can vegetable broth substitute beef broth?

Yes, using vegetable broth maintains a vegetarian version and still delivers rich flavor when combined with caramelized onions.

What types of cheese work well for topping?

Gruyère is traditional, but Emmental or Comté cheese provide similar melting qualities and flavor profiles.

How do you get the cheese bubbly and golden?

After assembling bowls with broth and bread, broil them in the oven for 5-7 minutes until the cheese bubbles and browns.

What bread is best for this dish?

Thick slices of baguette or rustic bread work best, as they hold up well under the melted cheese and broth.

How can I make a vegan version?

Replace beef broth with vegetable broth and use plant-based cheese alternatives that melt well.

Effortless 4-Ingredient French Onion

Caramelized onions simmered in rich broth, topped with crusty bread and melted Gruyère cheese for a flavorful treat.

Prep duration
15 minutes
Time to cook
50 minutes
Overall time
65 minutes
Created by Elise Porter


Skill level Easy

Cuisine Type French

Makes 6 Number of servings

Dietary details Meat-Free

What Goes In

Vegetables

01 3.3 pounds yellow onions, thinly sliced

Dairy

01 5.3 ounces Gruyère cheese, grated

Bread

01 6 thick slices baguette or rustic bread

Broth

01 8 cups low-sodium beef or vegetable broth

How to Make It

Step 01

Caramelize onions: Add sliced onions to a large heavy-bottomed pot over medium-low heat. Stir frequently and cook until deep golden brown and caramelized, 30 to 35 minutes. Add a splash of broth or water if onions begin to stick.

Step 02

Simmer broth with onions: Pour in the broth, bring to a gentle simmer, and cook uncovered for 15 minutes. Season with salt and freshly ground black pepper to taste.

Step 03

Preheat oven: Set oven to 400°F or set broiler to high.

Step 04

Assemble soup: Ladle hot soup into ovenproof bowls. Top each with a slice of bread and a generous sprinkle of grated Gruyère cheese.

Step 05

Broil until golden: Place bowls on a baking sheet and broil for 5 to 7 minutes until cheese bubbles and turns golden brown.

Step 06

Serve: Serve immediately, handling bowls carefully as they will be hot.

What You’ll Need

  • Large heavy-bottomed pot
  • Sharp knife
  • Ovenproof soup bowls
  • Baking sheet
  • Cheese grater

Allergy details

Double-check ingredients for allergens; talk with your doctor if you’re uncertain.
  • Contains gluten (bread) and milk (cheese). Use gluten-free bread and plant-based cheese to avoid allergens.

Nutrition info (for each serving)

Nutrition data is for reference and isn’t meant as health advice.
  • Calorie count: 270
  • Fat content: 9 grams
  • Carbohydrates: 36 grams
  • Protein amount: 10 grams