How to make French onion soup casserole (video)

Print this recipe
A brilliant French onion soup has the uncanny ability to take the edge off of a bad day. Hearty, savory, packed with incredible flavor and topped with intensely satisfying Gruyere cheese, this traditional dish has been comforting generations upon generations for a reason! Many may not even think it reasonable to make a homemade version due to the need for freshly caramelized onions, which can be seen as a daunting endeavor for first-time caramelizers.
On the contrary, caramelizing onions yourself is really as easy as it gets! It takes longer than one might expect, approximately 45 minutes, but much of this time is completely hands-off, and the end result will leave you absolutely breathless! A great trick is to caramelize more onions than you need for this recipe and save the extra onions in the fridge to use later in the week to liven up a roast chicken dinner or a side of mashed potatoes. Once you have access to this delicious ingredient, you won't ever look back!
Advertisement
Cooktop Cove
French onion soup casserole
6
15 minutes
1 hour, 15 minutes
1 hour, 30 minutes
1/2 French baguette, sliced into 1" thick pieces
2 tablespoon butter
1 tablespoon olive oil
3 large sweet onions. thinly sliced
1 tablespoon flour
1.5 cup beef stock
1 bay leaf
2 teaspoon thyme
1 teaspoon parsley
2 cups (450g) grated Gruyere cheese
1/2 teaspoon salt
1/4 teaspoon pepper
Begin by caramelizing the onions. In a large frying pan over medium heat, heat up the butter along with the thyme, parsley, bay leaf, salt and pepper. Pour in the sliced onions and leave to caramelize for 45 minutes - stirring every 10 minutes to ensure that they are not burning (although you want them to brown a little bit).
Once the onions are caramelized, remove them from the heat and set to one side. Preheat the oven to 350°F (175°C) and lightly grease a 3-quart casserole dish or 9" x 13" casserole pan. Place the sliced French baguette into the bottom of the casserole dish and spoon the caramelized onions evenly over the top. In a small bowl, quickly mix the flour together with the beef stock before pouring over the bread and onions.
Sprinkle the grated Gruyere cheese over the top of the casserole along with a pinch of salt and freshly ground black pepper. Cover the casserole with foil and place into the preheated oven for 30 minutes.
Pro tip: We always recommend caramelizing more onions than this recipe calls for and saving any extras in the fridge for later use!
Pro tip: For even more rich French onion soup flavor, simmer caramelized onions in broth for 30-45min first, then pour over bread together and continue with step 2.
Advertisement
Resources
Print this recipe
Share on Facebook

May 26   ·  
Advertisement
If you are like me, it's a struggle to think about what to put together for dinner. You want something easy to prepare, but also satisfying for hungry family members or guests.
May 24   ·  
This classic French dish is surprisingly easy to adapt into a casserole and makes for great leftovers!
May 24   ·  
 
Recommended
Advertisement