Mushroom Rice with French Onion Soup, Baked

Mushroom rice with French onion soup is a savory baked side made with long-grain rice, browned mushrooms, condensed French onion soup, and broth. Baking it covered lets the rice absorb the onion-rich liquid while the mushrooms add an earthy, hearty flavor, with little stirring required.

Ingredients

2 tablespoons (28 g) unsalted butter
1 teaspoon (5 ml) olive oil
8 ounces (225 g) cremini or white button mushrooms, wiped clean and sliced
2 garlic cloves (about 6 g), finely chopped
1½ cups (285 g) uncooked long-grain white rice, such as basmati or standard long-grain rice
1 can (10½ ounces/298 g) condensed French onion soup
1½ cups (355 ml) low-sodium beef broth or vegetable broth, warmed
½ teaspoon (1 g) dried thyme
¼ teaspoon (0.5 g) black pepper
2 tablespoons (8 g) chopped fresh parsley, for serving (optional)

Instructions

Heat the oven to 375°F (190°C). Set out a 2-quart (about 1.9-liter) oven-safe baking dish. If using a glass dish, make sure it is rated for oven use. Wipe the mushrooms clean with a damp paper towel rather than soaking them, then slice them about ¼ inch (6 mm) thick. Warm the broth in a small saucepan or microwave; it does not need to boil.
Set a large skillet over medium heat and add the butter and olive oil. When the butter has melted, add the mushrooms in an even layer. Cook for 7 to 8 minutes, stirring every couple of minutes, until the mushrooms have released their moisture and the pan is mostly dry. Let them take on a little golden color; crowding or stirring constantly can make them steam instead of brown.
Stir in the garlic and cook for about 30 seconds, just until fragrant. Add the uncooked rice and stir for 1 minute so the grains are coated in the butter and mushroom mixture. This brief toasting step adds a subtle nutty note and helps distribute the mushrooms through the finished dish.
Spoon the rice mixture into the baking dish. Add the condensed French onion soup, warm broth, dried thyme, and black pepper. Stir thoroughly, scraping the bottom and corners so no dry rice is left behind. The soup is already seasoned, so do not add salt before baking; you can taste the rice after it is cooked and season then if needed.
Cover the dish tightly with foil or a snug oven-safe lid and bake for 50 to 55 minutes. Check at 50 minutes: the rice should be tender and most of the liquid absorbed. If the grains are still firm or liquid remains, cover again and bake for another 5 minutes. Keep the cover on during cooking so steam stays in the dish; opening it repeatedly can slow the rice and leave the top unevenly cooked.
Remove the dish from the oven and leave it covered for 10 minutes. This resting time lets the last bit of moisture settle into the grains. Uncover, fluff gently with a fork, and taste for seasoning. Scatter the parsley over the top if using, then serve warm.

Tips

Choose the right soup. This recipe is written for condensed French onion soup, not a ready-to-serve bowl of soup. Condensed soup provides concentrated flavor without adding as much liquid. If you only have regular ready-to-serve French onion soup, use 2¾ cups (650 ml) of it in place of both the canned soup and broth; the finished rice will taste a little less concentrated.
Use low-sodium broth. Canned soup can be quite salty, and different brands vary. Low-sodium broth gives you more control. If your broth or soup is particularly salty, use water for some or all of the broth, then adjust seasoning after cooking.
Keep the cover tight. A loose foil cover lets steam escape and can leave the rice hard on top. Crimp foil firmly around the rim, or use a close-fitting lid. Avoid lifting the cover before the first check at 50 minutes.
Make it gluten-free only with suitable products. Rice is naturally gluten-free, but condensed soup and broth may contain wheat or other gluten-containing ingredients. Check their labels and choose products specifically marked gluten-free if needed; the flavor can vary slightly by brand.

Serving Suggestions

Serve this rice hot as a side for roast chicken, pork chops, steak, or baked tofu. Its savory onion-and-mushroom flavor also works alongside green beans, roasted carrots, or a crisp salad dressed with a simple vinaigrette. For a comforting meatless plate, pair it with roasted broccoli or cauliflower and a green vegetable, then spoon a little of the rice’s buttery cooking liquid over the vegetables.

It can also be a base for a simple bowl: add a fried or roasted vegetable, a handful of chopped parsley, and a little grated cheese at the table. The recipe serves six as a side; portions can be larger if you serve it as the main starch in a meal. Because the soup brings plenty of savory flavor, keep other sides relatively fresh or lightly seasoned rather than adding several salty dishes.

Variations

Make it vegetarian: Use vegetable broth and check that the French onion soup is made without beef stock. Some soups that sound vegetarian are prepared with beef broth, so the label matters. This version is still full-flavored, though its onion character may be a little lighter depending on the soup.

Add cheese: For a richer, gratin-like finish, uncover the cooked rice, sprinkle ½ cup (55 g) shredded Swiss or Gruyère over the top, and return the dish to the oven for 3 to 5 minutes, just until melted. Gruyère gives a nuttier, more assertive flavor; Swiss is milder. You can also offer grated cheese at the table to keep the rice lighter.

Change the mushrooms: Cremini and white button mushrooms are easy to find and cook at a similar pace. Shiitake mushrooms have a deeper, more pronounced flavor; remove and discard their tough stems before slicing. A mix of mushrooms is welcome, but keep the total close to 8 ounces (225 g) so they do not crowd the pan or release too much extra moisture.

Use fresh herbs: Replace the dried thyme with 1 tablespoon (about 3 g) chopped fresh thyme, or finish with a little chopped chive along with the parsley. Add delicate fresh herbs near the end rather than baking them for the full cooking time, so their flavor stays bright.

Storage and Reheating

Refrigerate leftovers within 2 hours of cooking. Transfer them to a shallow airtight container so they cool promptly, and keep them refrigerated for 3 to 4 days. Do not leave cooked rice sitting at room temperature for an extended period. For longer storage, freeze portions in airtight freezer-safe containers for up to 2 months for best texture; thaw overnight in the refrigerator before reheating.

To reheat a portion, add 1 to 2 teaspoons (5 to 10 ml) of water or broth per cup of rice, cover, and warm in the microwave, stirring once partway through. You can also reheat a larger amount in a covered oven-safe dish at 325°F (165°C), adding a splash of broth if it seems dry. USDA FSIS recommends reheating leftovers to 165°F (74°C); check the center with a food thermometer. Reheat only the amount you plan to eat, since repeated cooling and reheating can affect both quality and safe handling.

Frequently Asked Questions

Can I use brown rice instead of white rice?
Not as a direct swap. Brown rice takes longer to cook and usually needs a different amount of liquid, so it may remain firm in the time given here. For reliable results, use long-grain white rice; if adapting the recipe for brown rice, follow the cooking time and liquid ratio on its package and check the rice for tenderness before serving.

Can I make this recipe with uncooked mushrooms and rice in one step?
You can put the ingredients straight into the baking dish, but sautéing the mushrooms first improves their flavor and cooks off some of their moisture. If you skip that step, expect a softer, less browned mushroom flavor and potentially a wetter result. Keep the rice-to-liquid proportions the same and make sure the dish remains tightly covered.

Can I assemble it ahead of time?
For the best texture, cook it soon after combining the rice and liquid. If you need to prep ahead, slice the mushrooms and measure the other ingredients separately, then refrigerate the prepared mushrooms in a covered container and assemble just before baking. Uncooked rice left soaking in the soup mixture can absorb liquid unevenly and may bake inconsistently.

What if the rice is still firm when the liquid is absorbed?
Stir in 2 tablespoons (30 ml) hot broth or water, cover the dish tightly again, and bake for 5 to 10 minutes more. Let it stand covered for a few minutes before checking again. Older rice or an oven that runs cool can take longer, so tenderness is a better guide than the clock alone.

Can I use onion soup mix instead of canned French onion soup?
They are not identical: soup mix is a dry seasoning blend, while condensed soup contributes both liquid and body. Using a packet without adjusting the liquid will not reproduce this recipe. For the intended texture, use condensed French onion soup; if experimenting with a soup mix, follow its package directions to make a soup and carefully adjust the total liquid to suit the rice.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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