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Latest Comments

French Onion Soup Casserole


Updated September 13, 2016
(12 Votes)


French Onion Soup Casserole
French Onion Soup Casserole
This image courtesy of Blair Lonergan for

Why would you make plain old French onion soup when you can make French Onion Soup Casserole? This casserole recipe has all of the best components of traditional French onion soup, but the way it's made changes it into something completely new! Because it's baked in a casserole dish, the bread really soaks up the soup and becomes extremely flavorful. The cheese melts and browns in a perfect layer on top. Best of all, making the soup in a casserole dish makes it so much faster and easier than preparing individual servings.

Serves: 6

Preparation Time: 10 min

Cooking Time: 1 hr 30 min

  • 3 medium sweet onions, sliced
  • 3 tablespoons butter
  • 4 cups beef broth
  • 1 teaspoon Worcestershire sauce
  • Approximately 6-8 slices French bread, about 1/2-inch in thickness
  • 1 cup shredded mozzarella cheese
  • 1/2 cup grated Parmesan cheese
  1. Melt butter in a large saucepan over low heat. Add onions and cover. Cook for about 30 minutes, stirring occasionally.
  2. Add the beef broth and the Worcestershire sauce. Heat the broth mixture until it boils.
  3. Reduce heat to low. All to simmer, uncovered, for about 30 minutes. The broth will reduce.
  4. Pour onion and broth mixture into a greased casserole dish.
  5. Lightly toast the slices of bread. Place toasted bread in a single layer on top of onion/broth mixture.
  6. Cover bread with a thick layer of the shredded mozzarella and top with grated Parmesan.
  7. Bake, uncovered, in a 350 degree oven for 20 to 30 minutes, or until cheese is melted and brown on top.

5-Ingredient Skillet French Onion Chicken



For another spin on French onion soup, try this recipe for 5-Ingredient Skillet French Onion Chicken.




Before the French Onion Soup Casserole, There Was Simply a Soup...

Legend has it that the first French Onion Soup was actually created by King Louis the XV of France when all that could be found in the pantry of his hunting party’s lodge was butter, onions and champagne. While the story cannot be confirmed or denied as myth of fact, it is an interesting bit of lore.

Onions have been a choice staple in meal preparation from as far back Roman Times. This is likely because they are able to easily grow in most soils, they are cheap to buy and abundantly available, not to mention, they long have a high shelf-life. For this reason onions were seen as a poor man's food.

The modern-day version of the French Onion Soup has evolved from a much more basic recipe in which onions were sliced, fried and cooked in water. The soup would then be served with bread and capers. It was only in the 19th century that cooks started adding flour, salt and pepper and topped the soup with cheeses such as Gruyere.

If you've ever had this classic recipe, you're likely familiar with the present day version. It is most commonly made with caramelized onion in a beef-based broth. This is often served in individual ramekins and topped with Gruyere cheese, which is baked on top.


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This recipe looks sinful! I love bread bowls. It never occurred to me to put them in a casserole and see what comes out. What a really delicious-sounding take on traditional French onion soup. Can't wait to try this one.

Made this recipe tonight for dinner LOVED IT!!!!!! so much easier than making individual bowls and just as good. Made recipe as is no changes needed. YUM

I'm getting hungry just looking at this! I'm definitely making this sometime this week

This recipe sounds so interesting. I love french onion soup, so I definitely need to give this casserole a try.

I made this using the Au Jus Gravy Mix by McCormick...It came out absolutely awesome....

This recipe is a great twist on classical French Onion Soup.It looks really tasty. It would save time and cleaning of individual soup bowls. I will try it and serve it when my friends come over for lunch. A tossed garden salad would make a nice accompaniment.

What size casserole dish? 8x8? 9x13? This information would be helpful.

I think any size would work that your bread slices fit into. Just make sure there's space between the slices, so they get crusty all the way around. It sure looks delicious, doesn't it?! I think even the people in my family that don't like french onion soup will like these, as long as you like caramelized onions.

I never seem to be able to finish a bowl of French onion soup, but this casserole version was amazing! It had that great French onion flavor. I loved it!

I love French onion soup, so I bet this casserole recipe would be great for me.

Sounds wonderful!!! Can't wait to make it!

Delicious and super easy to make! My very picky husband loves it, he wanted french onion soup and I surprised him with this! Thanks for sharing!!


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