French Onion Ground Beef and Rice Casserole

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This French onion ground beef and rice casserole is a cozy, hands-off dinner made with savory beef, golden mushrooms, and rice baked right in a French onion broth. It’s a good pick for busy evenings when you want something filling without standing over the stove. A pan serving six gives roughly 25 grams of protein per portion (an estimate).

What Makes This French Onion Ground Beef and Rice Casserole Great?

The rice bakes in a rich, onion-heavy broth, so every bite tastes like French onion soup in casserole form. A browned beef and mushroom mixture goes in halfway through, and a melty, crunchy topping finishes it off.

The Rice Base

Honestly, this is where the magic happens. The rice soaks up the French onion soup and beef broth as it bakes, so it comes out tender and deeply flavored instead of plain. Warming the liquid before it goes in the dish helps the rice start cooking right away.

Use regular long grain white rice and keep it uncooked. Instant or pre-cooked rice turns mushy in this recipe.

What You’ll Need for the Rice Base

• 2 cans (10.5 oz each) condensed French onion soup, gives the casserole its sweet, oniony backbone.
• 1 can (10.5 oz) condensed beef broth, adds a deeper, meatier flavor.
• 1 1/4 cups reduced sodium beef broth, about one empty soup can’s worth, thins things out so the rice can cook without making it too salty.
• 2 cups uncooked long grain white rice, stays fluffy and separate instead of turning gluey.
• 4 tablespoons unsalted butter, sliced, melts over the rice and adds richness.

The Beef and Mushroom Mix

This is the hearty part of the dish. Caramelizing the onion a little longer than usual brings out a sweet, almost jammy flavor that echoes the soup. Browning the beef and mushrooms in the same skillet means they pick up all those tasty browned bits, which is soooo good.

Mushrooms release a lot of water, so give them room and a little patience. You want them golden, not steamed and soggy.

What You’ll Need for the Beef and Mushroom Mix

• 1 tablespoon olive oil, keeps the onion from sticking while it softens.
• 1 medium yellow onion, diced, turns sweet and golden as it cooks.
• 1 lb ground beef (90/10 or 85/15), lean enough to avoid a greasy casserole but with enough fat to stay juicy.
• 1/2 teaspoon garlic powder, adds savory depth that blends into the beef.
• 1/2 teaspoon black pepper, gives a gentle bite.
• 8 oz sliced cremini or white button mushrooms, bring an earthy, meaty flavor.
• 2 cloves garlic, minced, adds fresh garlic flavor that garlic powder can’t quite match.
• 1/2 teaspoon dried thyme, the classic herb for French onion flavors.
• 1 tablespoon reduced sodium soy sauce, boosts the savory, umami taste.
• 2 teaspoons Worcestershire sauce, adds a tangy, slightly sweet depth.

The Cheesy, Crunchy Topping

Want that bubbly French onion finish? This is it. Mozzarella gives you the melty stretch, and Gruyere brings a nutty flavor that fits right in. Crispy fried onions go on at the very end so they stay crunchy.

What You’ll Need for the Topping

• 1/2 cup shredded Gruyere cheese, nutty and a little sweet, just like on classic French onion soup.
• 1/2 cup shredded mozzarella cheese, melts smoothly and gives that cheese-pull moment.
• 1 1/2 cups crispy fried onions (about 2 oz), add crunch and extra onion flavor.

How to Make French Onion Ground Beef and Rice Casserole

Heat the Oven and Warm the Liquid

Preheat the oven to 400°F and lightly grease a 9×13 inch baking dish. Pour the French onion soup, condensed beef broth, and reduced sodium beef broth into a large saucepan. Heat over medium until steaming, about 5 minutes. Y

ou don’t need it to boil.

Start the Rice

Spread the uncooked rice evenly in the baking dish.

Carefully pour the hot liquid over the top and give it a quick stir so the rice is fully submerged. Lay the butter slices over the surface, then cover the dish tightly with foil.

Bake the Rice

Bake the covered dish for 35 minutes.

The rice will soften and start absorbing the broth, though it won’t be fully done yet.

That’s exactly what you want, because it finishes cooking later with the beef mixture.

Caramelize the Onion

While the rice bakes, heat the olive oil in a large skillet over medium heat.

Add the diced onion and cook, stirring now and then, for 8 to 10 minutes until soft and golden brown. Move it to a plate and set aside.

Brown the Beef

Turn the heat up to medium-high and add the ground beef, garlic powder, and black pepper.

Cook for 6 to 8 minutes, breaking the meat into small crumbles, until no pink remains and it reaches 160°F.

Drain off any extra fat, then return the skillet to the stove.

Cook the Mushrooms

Add the sliced mushrooms and thyme to the skillet and cook for 5 to 6 minutes, stirring only occasionally, until golden brown.

Stir in the minced garlic for the last 30 seconds so it smells amazing without burning.

Return the beef and onion to the skillet, then add the soy sauce and Worcestershire sauce and stir everything together.

Combine and Finish Cooking the Rice

Take the dish out of the oven when the 35 minutes are up, but leave the oven on. Remove the foil and stir in the beef and mushroom mixture.

Bake uncovered for 25 minutes, until the rice is tender and most of the liquid has been absorbed. If it still looks soupy, give it another 5 minutes.

Add the Topping

Scatter the Gruyere and mozzarella over the casserole, then sprinkle on the crispy fried onions. Bake for another 5 to 7 minutes, until the cheese is melted and bubbly and the onions are golden.

Let it rest for about 5 minutes before serving so everything settles.

Variations and Customizations

This casserole is easy to adjust, so use what you have on hand. Just keep the liquid and rice amounts the same, since they’re what make the rice cook properly.

• Swap the meat: ground turkey, ground chicken, or Italian sausage all work. Cook poultry to 165°F.
• Change the cheese: Swiss or provolone can stand in for the Gruyere.
• Add greens: stir in 3 cups of baby spinach with the beef mixture, and it will wilt as the casserole bakes.
• Add a splash of wine: replace 1/4 cup of the reduced sodium broth with dry white wine for a more restaurant-style flavor.
• Make it extra mushroomy: use 12 oz of mushrooms instead of 8 oz, and cook them a couple of minutes longer.

Toppings, Add-Ons, and Finishing Touches

The baked casserole is already rich and savory, so the best finishing touches add freshness or a bit of tang. A little something green or creamy cuts through the cheese nicely. Trust me on this one.

• Chopped fresh parsley or thyme leaves, for a fresh, herby finish.
• Sliced green onions, for a mild, crisp bite.
• A spoonful of sour cream or Greek yogurt, for cool creaminess.
• Extra crispy fried onions, for more crunch.
• A pinch of black pepper or a few drops of hot sauce, for a little heat.

Storing, Reheating, and Meal Prep

Let the casserole cool, then store it in an airtight container in the refrigerator for up to 4 days. Try to get it into the fridge within 2 hours of cooking. You can also freeze portions for up to 3 months, and it’s best to freeze them without the crispy onions, which go soft. Add fresh ones after reheating.

To reheat, add a splash of broth or water (about 1 to 2 tablespoons per serving) so the rice doesn’t dry out. Cover and microwave for 2 to 3 minutes, or warm it in a 350°F oven for 20 to 25 minutes until it reaches 165°F. For make-ahead prep, cook the beef and mushroom mixture up to a day ahead and keep it in the fridge. Assemble and bake the rice just before dinner.

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French Onion Ground Beef and Rice Casserole

Difficulty: Beginner Total Time 1 hr 30 mins

Servings: 6 Calories: 620

Description

A comforting, hands-off dinner where rice bakes in a rich French onion broth, then gets stirred together with browned beef, golden mushrooms, and caramelized onion. It is finished with melted Gruyere and mozzarella and a crispy fried onion topping.

Ingredients

Servings

For the Rice Base

• 2 cans condensed French onion soup (10.5 oz each)
• 1 can condensed beef broth (10.5 oz)
• 1 ¹⁄₄ cups reduced sodium beef broth
• 2 cups uncooked long grain white rice
• 4 tablespoons unsalted butter, sliced

For the Beef and Mushroom Mix

• 1 tablespoon olive oil
• 1 medium yellow onion, diced
• 1 lb ground beef (90/10)
• ¹⁄₂ teaspoon garlic powder
• ¹⁄₂ teaspoon black pepper
• 8 oz sliced cremini or white button mushrooms
• 2 cloves garlic, minced
• ¹⁄₂ teaspoon dried thyme
• 1 tablespoon reduced sodium soy sauce
• 2 teaspoons Worcestershire sauce

For the Topping

• ¹⁄₂ cup shredded Gruyere cheese
• ¹⁄₂ cup shredded mozzarella cheese
• 1 ¹⁄₂ cups crispy fried onions

Instructions

Heat the oven and warm the liquid

1. Preheat the oven to 400°F and lightly grease a 9×13 inch baking dish. Pour the French onion soup, condensed beef broth, and reduced sodium beef broth into a large saucepan. Warm over medium heat for about 5 minutes, until steaming. It does not need to boil, and it is fine if the soup looks thick at first because it will loosen as it heats.

Add the rice and liquid to the dish

1. Spread the uncooked rice evenly across the bottom of the baking dish. Carefully pour the hot liquid over the rice and give it a gentle stir so every grain is covered. Lay the butter slices over the top, then cover the dish tightly with foil so the steam stays inside.

Bake the rice

1. Place the covered dish in the oven and bake for 35 minutes. The rice will look softened but not fully cooked, and some liquid will still be visible. This is exactly right, because the rice finishes cooking later.

Caramelize the onion

1. While the rice bakes, warm the olive oil in a large skillet over medium heat. Add the diced onion and cook, stirring now and then, for 8 to 10 minutes, until soft, golden, and lightly browned at the edges. Move the onion to a plate and set it aside.

Brown the beef

1. Turn the heat up to medium-high and add the ground beef, garlic powder, and black pepper to the same skillet. Cook for 6 to 8 minutes, breaking the meat into small crumbles with a spoon, until no pink remains and the beef reaches 160°F. Drain off any excess fat, then return the skillet to the stove.

Cook the mushrooms

1. Add the sliced mushrooms and dried thyme to the skillet. Cook for 5 to 6 minutes, stirring only occasionally, until the mushrooms are golden brown and fragrant. They will release water first and then brown, so a little patience helps here. Stir in the minced garlic for the last 30 seconds, then add the beef and onion back to the skillet along with the soy sauce and Worcestershire sauce. Stir until everything is evenly coated and glossy.

Combine with the partly baked rice

1. When the 35 minutes are up, carefully remove the dish from the oven and leave the oven on. Lift off the foil, watching for hot steam, and stir the beef and mushroom mixture into the rice. Spread everything into an even layer.

Finish baking the rice

1. Return the uncovered dish to the oven and bake for 25 minutes, until the rice is tender and most of the liquid has been absorbed. If it still looks soupy, bake for 5 more minutes. The mixture will continue to thicken as it rests.

Add the topping

1. Sprinkle the Gruyere and mozzarella evenly over the casserole, then scatter the crispy fried onions on top. Bake for 5 to 7 minutes, until the cheese is melted and bubbling and the onions are golden brown. Let the casserole rest for 5 minutes before serving so it sets and is easier to scoop.

Note

Use long grain white rice that is uncooked. Instant or pre-cooked rice will turn mushy in this recipe.

Keep the foil tight on the first bake so the steam cooks the rice evenly. If your foil does not seal well, cover the dish with a second sheet.

If the rice is still firm after the second bake, add 1/4 cup warm beef broth, cover with foil, and bake for 10 more minutes.

If the casserole looks greasy, drain the beef well and use 90/10 ground beef.

Add the crispy fried onions only at the end so they stay crunchy.

To store, cool the casserole and refrigerate in an airtight container within 2 hours of cooking. It keeps for up to 4 days in the refrigerator.

To freeze, portion the casserole without the fried onions and freeze for up to 3 months. Thaw overnight in the refrigerator before reheating.

To reheat, add 1 to 2 tablespoons of broth or water per serving, cover, and microwave for 2 to 3 minutes, or warm in a 350°F oven for 20 to 25 minutes, until the center reaches 165°F.

Calories are an estimate based on 6 servings of about 1 1/2 cups each and will vary with the brands and ground beef fat percentage you use.

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