French Onion Soup with Portobello Cheese "Toast"


Roasted portobello mushrooms stuffed with cheese, herbs and breadcrumbs stand in for the traditional Gruyère toast you'd find on top of a crock of French onion soup.

French Onion Soup with Portobello Cheese "Toast"
Prep Time:
45 mins
Total Time:
45 mins
4 servings
Nutrition Profile:


  • 4 tablespoons extra-virgin olive oil, divided

  • 2 tablespoons butter

  • 2 large sweet onions, sliced

  • 1 medium red onion, sliced

  • 4 medium portobello mushrooms, stems and gills removed

  • ½ teaspoon ground pepper, divided

  • 2 tablespoons chopped garlic

  • 2 teaspoons chopped fresh thyme or 1/2 teaspoon dried

  • ¼ cup dry sherry

  • ½ teaspoon salt

  • 4 cups unsalted beef broth

  • ½ cup shredded Gruyère cheese

  • ¼ cup plain dry breadcrumbs

  • 1 tablespoon minced fresh chives


  1. Position racks in middle and upper thirds of oven; preheat to 450 degrees F. Coat a rimmed baking sheet with cooking spray.

  2. Heat 2 tablespoons oil and butter in a large pot over medium-high heat. Add sweet and red onions and stir to coat. Cover, reduce heat to medium and cook, stirring often and scraping up any browned bits, until golden brown, 25 to 30 minutes.

  3. Meanwhile, place mushrooms caps, gill-side up, on the prepared pan. Brush with 1 tablespoon oil and sprinkle with 1/4 teaspoon pepper. Roast on the middle rack until tender, 10 to 15 minutes. Remove from oven and preheat broiler to high.

  4. Add garlic and thyme to the onions and cook, uncovered, for 2 minutes more. Stir in sherry, salt and the remaining 1/4 teaspoon pepper; increase heat to medium-high and bring to a simmer. Cook, stirring often, until most of the liquid has evaporated, about 1 minute. Stir in broth and return to a simmer. Reduce heat and simmer for 10 minutes.

  5. Meanwhile, combine Gruyère, breadcrumbs, chives and the remaining 1 tablespoon oil in a small bowl. Divide the mixture among the mushroom caps. Broil the mushrooms until the filling is lightly browned, about 1 minute.

  6. Divide the soup among 4 bowls and serve topped with a mushroom "toast."

Nutrition Facts (per serving)

370 Calories
25g Fat
25g Carbs
12g Protein
Nutrition Facts
Servings Per Recipe 4
Serving Size 1 1/2 cups soup & 1 "toast"
Calories 370
% Daily Value *
Total Carbohydrate 25g 9%
Dietary Fiber 4g 13%
Total Sugars 12g
Protein 12g 24%
Total Fat 25g 32%
Saturated Fat 8g 42%
Cholesterol 30mg 10%
Vitamin A 361IU 7%
Vitamin C 12mg 14%
Folate 81mcg 20%
Sodium 581mg 25%
Calcium 205mg 16%
Iron 1mg 7%
Magnesium 39mg 9%
Potassium 767mg 16%

Nutrition information is calculated by a registered dietitian using an ingredient database but should be considered an estimate.

* Daily Values (DVs) are the recommended amounts of nutrients to consume each day. Percent Daily Value (%DV) found on nutrition labels tells you how much a serving of a particular food or recipe contributes to each of those total recommended amounts. Per the Food and Drug Administration (FDA), the daily value is based on a standard 2,000 calorie diet. Depending on your calorie needs or if you have a health condition, you may need more or less of particular nutrients. (For example, it’s recommended that people following a heart-healthy diet eat less sodium on a daily basis compared to those following a standard diet.)

(-) Information is not currently available for this nutrient. If you are following a special diet for medical reasons, be sure to consult with your primary care provider or a registered dietitian to better understand your personal nutrition needs.

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