This savory French Onion Soup Casserole has all the goodness and flavors of your favorite French onion soup. Sweet caramelized onions, Gruyère cheese, fresh thyme leaves and sourdough French bread. All layered together in a casserole, then soaked with a rich flavorful broth.
What is a Panade?
A panade is a rustic, bread-based casserole made with dry bread, vegetables and/or meat layered together and soaked in a rich, flavorful broth. It usually has a generous chunk of cheese grated between the layers and over the top. It will be soft, creamy and drippy with broth.
Is a Panade the Same as a Bread Pudding or a Strata?
A panade, bread pudding, and a strata are similar in that they are all made with stale, dry bread. But the differences are in the liquid used to soak into that dry bread.
- A panade has a soaking liquid of hot broth, either chicken or beef with maybe some wine mixed into the broth. Hard grated cheese such as Parmesan on top makes a crisp, crunchy top.
- Bread puddings are usually always sweet desserts. Our Pumpkin Bread Pudding and creamy Bananas Foster Bread Pudding are good examples. When making bread pudding, the liquid is a combination of sugar, eggs, milk, and cream with the eggs and milk in equal proportions. This makes a soft, custardy interior. Butter brushed on top gives the dessert a nice toasty crust.
- A strata is also an egg-milk concoction that is savory rather than sweet. There are more eggs than milk to the mixture. There may also be a creamy cheese blended into the mixture like in our Asparagus-Ham and Gouda Breakfast Strata. The high egg/cheese protein makes a strata a great brunch entree.
How to make a French Onion Soup Casserole:
- First, melt the butter, then add the onions and salt, toss them together. Put a lid on the pot and cook for 15 minutes so they release their juices. Lift the lid occasionally and give them a stir so they do not burn. Once the onions cook down a bit and release some liquid, remove the lid and increase the heat to medium-high. Continue cooking and stirring regularly until onions are tender and dark golden brown.
- It is going to take about 45 minutes to get a nice caramelization to the onions. Then take them off the heat and add a good white wine. Be sure to scrape up all the brown bits of onion stuck to the pan bottom, then stir in the fresh thyme leaves. The onions will be savory, sweet and yummy!
- While the onions are cooking, heat about two quarts of beef broth in a saucepan and keep it simmering on a back burner. If you have a homemade beef broth it will really enhance the flavor of French onion soup casserole but the canned broth works great as well. You can also use a canned or homemade chicken broth rather than beef broth.
- Gruyère is the classic cheese used for French onion soup and it melts smooth and creamy. The Parmesan cheese adds a tangy taste to the panade casserole. Add the grated cheeses to a bowl and toss them to combine.
Assemble the French Onion Soup Casserole:
This French onion soup casserole is best served in a shallow soup bowl with any remaining hot broth. Serve with a green salad and a crisp glass of your favorite white wine.
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- 1 large, 24-ounce loaf French sourdough bread, pre-sliced
- 8 tablespoons (4 ounces) unsalted butter, divided
- 2 tablespoons extra-virgin olive oil
- 5 pounds (about 6 large) yellow onions, thinly sliced
- Sea salt
- 1/2 cup white wine
- 1/4 cup fresh thyme leaves
- 12 ounces Gruyère cheese, grated (about 3 cups)
- 3 ounces Parmesan, finely grated (about 1 1/3 cups)
- 5 to 6 cups beef stock
- Freshly ground white pepper
- 2 tablespoons butter, cut into small cubes
Preheat the oven to 325°F
- Cut the crusts off the bread slices then place the slices in single layers on 2 or 3 sheet pans. Toast the bread for 20 minutes, then flip slices, and rotate pans to ensure even toasting.
- Toast until dried out and lightly golden, about 35-40 minutes total. Set aside.
- Turn oven off until later.
While the bread is toasting:
- Set a large Dutch oven or large pot over medium heat. Add 4 tablespoons butter and olive oil. When butter has melted, add onions and 1-1/2 teaspoons salt. Cook covered for 15 minutes, stirring occasionally with a wooden spoon and scraping up bits from the bottom.
- Once the onions cook down they will release some liquid, remove lid and increase heat to medium high. Continue cooking and stirring occasionally until onions are golden brown, about 45 minutes total.
- Turn off heat, add the wine and stir to deglaze the pan. Taste, and adjust salt as needed, stir in the fresh thyme leaves and set aside.
- Place both cheeses in a medium bowl, and mix to combine.
- Heat the oven to 400°F and adjust oven rack to center position.
- Coat the inside of a deep 9-by-13-inch baking dish with oil spray. Line the bottom with a layer of toasted bread, breaking up pieces as needed to form a solid layer.
- Spoon half the onion mixture evenly over the bread. Sprinkle with 1/3 of the cheese mixture, and season with pepper. Continue layering with bread, the remainder of the onions and another 1/3 of the cheese. Top off with a final layer of bread.
- Ladle 3 cups of hot broth over the panade, then wait a minute, and allow the bread to absorb the liquid. Press down on panade with a metal spatula, add as much broth as the panade will absorb without overflowing.
- Dot the top layer with remaining butter, then cover with a piece of oil-sprayed foil.
- Place casserole dish on a baking sheet to catch any overflow, then transfer to the center rack.
- Bake for 30 minutes, then remove foil and sprinkle with remaining 1/3 of cheese and return to oven for 15 minutes more. Bake until golden brown.
- Remove casserole from the oven, and allow it to cool for 10 minutes before serving.
- You may not need all of the bread slices. We used 10 slices total.
- Turn the oven off after toasting the bread. Preheat to 400°f after the onions have cooked.
- Allow the panade to rest for 10 minutes before serving.
- Reheat any remaining broth and serve in the dish with each portion.
Serving Size1 3x4-inch Square
Amount Per ServingCalories 606 Total Fat 36g Saturated Fat 20g Trans Fat 0g Unsaturated Fat 14g Cholesterol 94mg Sodium 1306mg Carbohydrates 42g Fiber 3g Sugar 7g Protein 27g