French Onion Soup Casserole

I love this casserole at Thanksgiving!

Prep Time:
15 mins
Cook Time:
15 mins
Total Time:
30 mins
6 servings


  • 5 tablespoons salted butter, divided

  • 4 medium onions, chopped

  • 2 tablespoons all-purpose flour

  • 1 pinch ground black pepper

  • ¾ cup beef broth

  • ¼ cup dry sherry

  • 1 ½ cups plain croutons

  • ½ cup shredded Swiss cheese

  • 3 tablespoons grated Parmesan cheese


  1. Set an oven rack about 6 inches from the heat source and preheat the oven's broiler.

  2. Heat 3 tablespoons of butter in a pot over medium-high heat. Cook onions in the hot butter until tender, 5 to 7 minutes. Blend in flour and pepper. Add broth and sherry; cook and stir until thickened and bubbly. Pour into a 1-quart casserole dish.

  3. Melt remaining 2 tablespoons butter and toss with croutons. Spoon over onion mixture. Sprinkle with Swiss and Parmesan cheeses.

  4. Place under the preheated broiler just until cheeses melt, about 5 minutes. Serve immediately.

Nutrition Facts (per serving)

254 Calories
17g Fat
17g Carbs
9g Protein
Nutrition Facts
Servings Per Recipe 6
Calories 254
% Daily Value *
Total Fat 17g 21%
Saturated Fat 10g 52%
Cholesterol 46mg 15%
Sodium 359mg 16%
Total Carbohydrate 17g 6%
Dietary Fiber 2g 6%
Total Sugars 4g
Protein 9g
Vitamin C 6mg 28%
Calcium 218mg 17%
Iron 1mg 4%
Potassium 165mg 4%

* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

** Nutrient information is not available for all ingredients. Amount is based on available nutrient data.

(-) Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.

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