French Onion Soup Rice Casserole (Print View)
Savory casserole of caramelized onions, Gruyère, and rice simmered in rich broth, topped with toasted croutons.
# What You Need:
→ Vegetables
01 - 2 large yellow onions, thinly sliced
02 - 2 cloves garlic, minced
→ Grains
03 - 1 cup long-grain white rice, rinsed
→ Dairy
04 - 2 tablespoons unsalted butter
05 - 1 cup shredded Gruyère cheese
06 - 1/4 cup grated Parmesan cheese
→ Liquids
07 - 2 1/4 cups low-sodium beef or vegetable broth
08 - 1/4 cup dry white wine (optional)
→ Pantry
09 - 1 tablespoon olive oil
10 - 1 teaspoon fresh thyme leaves (or 1/2 teaspoon dried)
11 - 1/2 teaspoon salt, or to taste
12 - 1/4 teaspoon black pepper
→ Topping
13 - 1 cup French bread croutons or cubes, toasted
# How to Make It:
01 - Preheat oven to 375°F (190°C). Lightly grease a 2-quart casserole dish and set aside.
02 - In a large skillet, heat olive oil and butter over medium-low heat. Add the thinly sliced onions with a pinch of salt. Cook, stirring frequently, until the onions are deeply caramelized and golden brown, approximately 25 minutes.
03 - Add minced garlic and thyme leaves to the caramelized onions. Stir and cook for 1 minute until fragrant.
04 - Pour in the dry white wine (if using), scraping up any browned bits from the bottom of the skillet. Let simmer for 2–3 minutes to reduce slightly.
05 - Stir the rinsed rice into the onion mixture, coating each grain. Cook for 2 minutes to lightly toast the rice.
06 - Transfer the onion-rice mixture to the prepared casserole dish. Pour in the broth, season with salt and pepper, and stir gently to combine.
07 - Cover the casserole tightly with aluminum foil and bake for 30 minutes until the rice has absorbed the liquid.
08 - Remove the foil and fluff the rice with a fork. Sprinkle shredded Gruyère and grated Parmesan evenly over the top, then scatter the toasted bread croutons. Bake uncovered for an additional 10–12 minutes until the cheese is melted and bubbling.
09 - Remove from the oven and let stand for 5 minutes before serving to allow the casserole to set.
# Expert Tips:
01 -
- It gives you every bit of that bistro French onion flavor without needing to master a proper soup or own ramekins.
- The croutons on top get crunchy while the rice underneath stays creamy and soaked in broth, so every bite is a contrast of textures.
02 -
- If you rush the onion caramelization by turning up the heat you will get bitter char instead of sweet depth, so stay patient and keep the heat at medium-low.
- Do not skip covering the dish with foil for the first bake, because uncovered rice will dry out before it has time to cook through.
03 -
- Slice your onions as evenly as humanly possible because thin pieces caramelize faster and uniformly while thick rings hold raw crunch and throw off the whole dish.
- Shred your own cheese from a block instead of using pre-shredded bags, since the anti-caking powder on bagged cheese prevents it from melting into those gorgeous stretchy pools.