French Onion Soup Grilled Cheese

French onion soup grilled cheese sandwich

The Spruce / Julia Hartbeck

Prep: 5 mins
Cook: 45 mins
Total: 50 mins
Servings: 2 servings
Nutrition Facts (per serving)
1004 Calories
69g Fat
53g Carbs
42g Protein
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Nutrition Facts
Servings: 2
Amount per serving
Calories 1004
% Daily Value*
Total Fat 69g 88%
Saturated Fat 32g 161%
Cholesterol 155mg 52%
Sodium 1662mg 72%
Total Carbohydrate 53g 19%
Dietary Fiber 6g 21%
Protein 42g
Calcium 1280mg 98%
*The % Daily Value (DV) tells you how much a nutrient in a food serving contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.
(Nutrition information is calculated using an ingredient database and should be considered an estimate.)

Take all the classic flavors of French onion soup and turn them into one majorly luxurious sandwich. With caramelized onions and plenty of gooey gruyere, this sammie might give both the soup and regular grilled cheese a run for its money.


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  • 2 tablespoons butter
  • 1 large yellow onion (sliced super thinly)
  • 2 tablespoons red wine
  • 4 pieces bread
  • 2 tablespoons mayo
  • 1/2 pound gruyere cheese (sliced thinly)

Steps to Make It

  1. Gather the ingredients.

    french onion soup grilled cheese ingredients gathered

    The Spruce / Julia Hartbeck

  2. First caramelize the onions. Heat a skillet over medium heat. Add 1 tablespoon of the butter and melt. Add the onions and cook, stirring them continuously. This may take about 30 minutes. You want a uniform deep golden brown color.

    sliced onions in pan cooking and beginning to caramelize

    The Spruce / Julia Hartbeck

  3. When your onions are caramelized, add the red wine to deglaze the pan. Scrape up any brown bits and let the wine evaporate at least half. Season with salt and set aside.

    caramelized onions in pan, being deglazed and salted

    The Spruce / Julia Hartbeck

  4. Slather each slice of bread with some mayo. The mayo side will be the outside.

    bread slices being spread with mayo

    The Spruce / Julia Hartbeck

  5. Take 1 slice of the bread and on the un-mayoed side, put a big spoonful of onions. Top with half the cheese and close with the other slice of bread, mayo side out. Do this twice for the 2 sandwiches.

    bread slices being topped with caramelized onion on one side and cheese on the other

    The spruce / Julia Hartbeck

  6. Place the remaining butter in a skillet and heat over medium high heat. Grill both sides until golden brown and cheese is melty.

    sandwiches being grilled in a pan until golden brown

    The Spruce / Julia Hartbeck