I am absolutely obsessed with French Onion Soup Casserole. This recipe has been a staple in my household for years, and it’s a favorite among my family and friends. The moment I took my first bite, I knew I had stumbled upon something special.
The combination of caramelized onions, rich beef broth, and melted cheese is pure magic. It’s a flavor profile that never fails to impress, and it’s become a go-to dish for any occasion, whether it’s a family gathering or a casual weeknight dinner. What I love most about this recipe is its simplicity – it’s incredibly easy to make, yet it’s packed with depth and complexity.
The best part? It’s also relatively healthy, thanks to the abundance of vegetables and lean protein. As a busy mom, I appreciate recipes that are both delicious and nutritious.
This French Onion Soup Casserole checks all the boxes and then some. My kids adore it, and they always ask for seconds (or thirds). I’ve even served it at potlucks and dinner parties, where it’s always been a hit.
So if you’re looking for a new recipe to add to your rotation, look no further than this French Onion Soup Casserole. Trust me, you won’t be disappointed! My only regret is not discovering this recipe sooner – I’m pretty sure it would have made our family meals so much more enjoyable over the years.
French Onion Soup Casserole
4.6 from 929 votes
This French onion soup casserole transforms the classic soup into a hearty baked dish with caramelized onions, crusty bread, and melted Gruyère cheese. It is a comforting one-pan meal that captures all the rich flavors of the original in a convenient casserole form.
1 loaf French bread, cut into 1-inch cubes (about 6 cups)
2 cups shredded Gruyère cheese
1/2 cup grated Parmesan cheese
👨🍳Directions
1Preheat your oven to 375°F.
2In a large skillet or Dutch oven over medium heat, melt the butter with the olive oil.
3Add the sliced onions, salt, pepper, and sugar, stirring to coat; cook for 10 minutes, stirring occasionally, until the onions soften and begin to brown.
4Reduce the heat to medium-low and continue cooking the onions for 20 to 25 minutes, stirring every few minutes, until they are deep golden brown and caramelized.
5Pour in the white wine and scrape up any browned bits from the bottom of the pan; let the wine simmer for 2 minutes until mostly evaporated.
6Add the beef broth, Worcestershire sauce, dried thyme, and bay leaf to the onions.
7Bring the mixture to a gentle simmer over medium heat, then reduce the heat to low and cook for 10 minutes to blend the flavors.
8Remove the bay leaf and discard.
9Spread the bread cubes evenly in the bottom of a 9×13 inch baking dish.
10Pour the onion and broth mixture over the bread, pressing down gently with a spatula so the bread absorbs the liquid.
11Sprinkle the shredded Gruyère and grated Parmesan evenly over the top.
12Bake the casserole in the preheated oven for 20 to 25 minutes, until the cheese is melted and bubbly and the edges are golden brown.
13For a deeper color, switch the oven to broil for the last 2 minutes, watching closely to prevent burning.
14Let the casserole rest for 5 minutes before serving.
For a richer flavor, use a combination of Gruyère and Swiss cheese. You can prepare the caramelized onions up to 2 days ahead and refrigerate them, then assemble the casserole just before baking. Leftovers can be stored in the refrigerator for up to 3 days and reheated in the oven at 350°F until warm.
Watch Video Of How French Onion Soup Casserole Works
This French Onion Soup Casserole is always a good idea for any occasion – whether you’re hosting a family dinner or need a comforting meal after a long day. Its rich flavors and satisfying texture make it perfect for any gathering.
One of my favorite things about this recipe is how easily it reheats – simply place individual portions in the microwave or oven until hot through, and serve with some crusty bread on the side. For storage purposes, let the casserole cool completely before refrigerating or freezing; when reheating, be sure to check on it every few minutes to avoid overcooking.
❓ Frequently Asked Questions About French Onion Soup Casserole
Q: What is the origin of French Onion Soup Casserole?
A: This dish has its roots in traditional French cuisine, where onion soup was a staple during the Middle Ages. The casserole version we know today is an American adaptation of this classic recipe.
Q: Can I use pre-made onion soup mix instead of making my own caramelized onions?
A: While you can use pre-made onion soup mix as a shortcut, keep in mind that it will alter the flavor profile of your dish significantly. If you choose to use the mix, be sure to adjust the amount of seasoning accordingly.
Q: Can I substitute beef broth with chicken or vegetable broth?
A: While you can use these alternatives as substitutes, keep in mind that they will change the flavor profile of your dish slightly. Beef broth is an essential component of this recipe, so if possible, stick with it for the most authentic taste.
Q: Can I make this recipe ahead of time?
A: Yes! You can prepare the casserole up to 24 hours in advance and store it in the refrigerator until ready to bake.
Q: How do I serve leftovers?
A: Leftover casserole can be refrigerated for up to 5 days or frozen for up to 3 months. Reheat individual portions in the microwave or oven until hot through.
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