French Onion Soup Casserole

An easy side dish recipe with toasted, crusty bread dipped in a thick French Onion Soup base topped with gooey, buttery melted cheese.

JUMP TO RECIPE

I literally just made this, snapped some pics, tasted it then completely abandoned my messy kitchen to rush to my computer to write this recipe out because you NEED this recipe!

As I sit here plucking away at the keyboard, it looks like a bomb went off in the kitchen… there are cabinet doors open, onion peels on the floor, dishes all over the counters and I don’t care because I have to tell you about this NOW!!

I bought one of those ridiculously huge bags of crusty hoagie rolls from Sam’s Club and was wondering what to do with the half of the bag we haven’t eaten yet. I had an idea to make this and thought, meh, why not? If it doesn’t work out, so be it.

Oh, it worked out, y’all. It. Worked. Out. And it might just be my new favorite side dish! Seriously!!

I love French Onion Soup. Like, I LOVE IT, love it. So, I thought making a casserole with all the main ingredients would be a great side dish… a different side dish… because don’t you get bored with the usuals??

The Big Girl came home today, saw it sitting on the stove, heated some up then walked around the corner with her mouth full, fork already working on the next bite and said it might be her second favorite recipe (the Pastalaya holding strong in the #1 spot).

Mama came in later, heated some up and said, oh this one’s a keeper! As I’ve said before, high praise from Mama doesn’t come lightly. If she says something’s good, she means it.

And honestly, it felt really good to know it wasn’t just me thinking this tastes amazing!  

The bread is toasty and crusty and the perfect texture to soak up the buttery, thick French Onion Soup base. It holds its shape for perfect individual servings but the bottom of the bread soaks up the rich stock and clings to the caramelized onions. 

INGREDIENTS FOR FRENCH ONION SOUP CASSEROLE

• Leftover crusty bread, sliced thick
• Butter
• Onions & garlic
• Salt, pepper and thyme
• Canned French Onion Soup
• Shredded cheese

NOTES ABOUT FRENCH ONION SOUP CASSEROLE

• Use any crusty bread such as French baguettes, hoagie rolls, Italian bread, etc. Cut bread about 2-inches thick, using enough to fill a 13x9 baking dish.
• Toasting the bread adds flavor and ensures the bread doesn’t completely disintegrate in the soup mixture.
• Swiss or provolone cheese can be substituted for gruyere.
• Don’t prepare the soup or add water before adding to the garlic and onions.
• You can make a smaller batch by halving the ingredients and cooking the same.

Love the flavors of French Onion soup?? Check out these recipes too!

• French Onion Chicken Casserole - An easy, creamy chicken noodle casserole with French onion soup, topped with toasty buttered bread cubes and crispy fried onions.
• French Onion Potatoes - A super easy 5-ingredient casserole recipe with tender potato pieces cooked in a savory, buttery onion soup base topped with cheese.

Recipe for French Onion Soup Casserole

French Onion Soup Casserole

Yield: 15-20 Servings

Author: Mandy Rivers | South Your Mouth

Prep time: 25 MinCook time: 20 MinTotal time: 45 Min

An easy side dish recipe with toasted, crusty bread dipped in a thick French Onion Soup base topped with gooey, buttery melted cheese.

Ingredients

• 15-20 thick slices bread (see notes)
• 1/2 cup butter
• 1 large onion, sliced
• 1/2 teaspoon pepper
• 1/2 teaspoon dried thyme
• 1/4 teaspoon salt
• 1 tablespoon minced garlic
• 2 10-oz cans French Onion Soup
• 2 cups shredded gruyere cheese

Instructions

1. Sauté onions in butter over medium heat for about 15 minutes or until very tender and lightly caramelized.
2. Add pepper, thyme, salt and garlic then cook for 2 minutes. Add both cans of soup (do not prepare first or add water). Reduce heat to low then simmer for 5 minutes.
3. Place bread slices, cut side-up on a baking sheet then broil on high until lightly toasted. Flip slices over then toast the other side as well. Set aside. Preheat oven to 375 degrees.
4. Pour onions and soup mixture into a 13x9 baking dish. Working one at a time, place each slice of toasty bread into the dish to soak up a little soup, then flip over. Continue until the bread slices are arranged snugly in the dish.
5. Sprinkle cheese over bread slices then bake at 375 degrees for 20-25 minutes or until cheese is bubbly and starting the brown.
6. Garnish with fresh chives if desired then serve immediately.

Notes

• Use any crusty bread such as French baguettes, hoagie rolls, Italian bread, etc. Cut bread about 2-inches thick, using enough to fill a 13x9 baking dish.
• Toasting the bread adds flavor and ensures the bread doesn’t completely disintegrate in the soup mixture. 
• Swiss or provolone cheese can be substituted for gruyere.
• Don’t prepare the soup or add water before adding to the garlic and onions.
• You can make a smaller batch by halving the ingredients and cooking the same.

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French Onion Chicken Casserole

https://www.southyourmouth.com/2022/03/french-onion-soup-casserole.html

Images and text © South Your Mouth LLC

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side dish, casserole

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