The French Onion Ground Beef and Rice Casserole is comfort food perfection, weaving together the flavors of sweet caramelized onions, melty cheese, earthy mushrooms, and savory beef—all nestled within tender rice. Each bite is loaded with the deep, nostalgic notes of classic French onion soup, but with the heartiness of a stick-to-your-ribs casserole that will have friends and family swooning at the dinner table. If you crave easy weeknight magic that still feels special, this recipe checks every box.

French Onion Ground Beef and Rice Casserole Recipe - Recipe Image

Ingredients You’ll Need

With just a handful of pantry staples and fresh ingredients, you’ll unlock vibrant layers of taste and irresistible creaminess. Every component in the French Onion Ground Beef and Rice Casserole plays a starring role, contributing that perfect touch of nostalgia, richness, or satisfying texture.

Laura’s Lean 96% Lean/4% Fat Ground Beef (16 oz): Lean and flavorful, this beef brings protein and depth without greasiness.
Ground Black Pepper (½ tsp): Brings a sharp, warm bite that balances out the richness.
Italian Herbs (1 tsp): A blend that infuses the entire casserole with herby aroma.
Thyme (½ tsp): Adds a classic French flair that pairs beautifully with onions and beef.
Unsalted Butter (3 tbsp): For sautéing, adding richness and perfecting the texture of the onions.
Onion Soup Mix (1 oz, 1 pouch): Delivers a concentrated onion flavor and savory undertones.
Garlic, minced (1 clove): Brings subtle pungency and layers of flavor.
Vidalia Onion, sliced (1 large): Sweet onions caramelize into the signature foundation of the dish.
Beef Broth (2 cups): Fortifies the casserole with comforting, savory juices.
Dry Sherry Wine (½ cup): Accentuates sweetness and complexity—don’t skip it!
White Long Grain Rice (1¼ cups): Only use this type for the perfect fluff and absorption.
Mushrooms, sliced (1 cup): Add earthiness and a meaty bite.
Whole Milk (½ cup): Gives the casserole a silky, creamy finish.
Sour Cream (1¼ cups): Lends tang and keeps everything moist and luxurious.
Shredded Cheese (2 cups): Melts to gooey, bubbly greatness; use your favorite kind.
Balsamic Red Wine Vinegar (1 tbsp): A dash of acidity brightens and balances the richness.

How to Make French Onion Ground Beef and Rice Casserole

Step 1: Sauté the Aromatics

Begin by preheating your oven to 350°F. In a large skillet, melt the unsalted butter over medium heat. Toss in the sliced Vidalia onion and minced garlic. Let them cook, stirring occasionally, until the onions are soft, translucent, and just starting to take on that irresistible golden hue—about 5 to 7 minutes. This is where the sweet, deep onion flavor of the French Onion Ground Beef and Rice Casserole begins!

Step 2: Brown the Beef

Add the lean ground beef directly into the skillet with your fragrant onion mixture. Use a sturdy spoon to break the beef up as it cooks, making sure every crumble gets nicely browned. There’s no need for excess grease in this recipe, so drain off any unwanted fat after the beef turns from pink to brown.

Step 3: Build the Flavor Base

Sprinkle in the onion soup mix, Italian herbs, thyme, ground black pepper, and the sliced mushrooms. Stir everything together, letting the flavors meld and the mushrooms cook down for about 3 minutes. This savory medley brings tons of umami and depth to your casserole.

Step 4: Deglaze and Simmer

Pour in the beef broth and the dry sherry wine, using your spoon to scrape up any caramelized bits on the bottom of the skillet. Let the mixture come to a gentle simmer and cook for 5 minutes, so the liquids reduce and the flavors intensify—the French Onion Ground Beef and Rice Casserole owes so much of its classic taste to this step.

Step 5: Add the Rice and Simmer Again

Stir in your white long grain rice, ensuring it’s evenly distributed and submerged. Lower the heat, cover the skillet, and let everything gently simmer for 15 minutes. The rice should be partially cooked and soaking up those beefy, oniony juices.

Step 6: Make the Creamy Topping

In a bowl, whisk together the whole milk, sour cream, balsamic red wine vinegar, and half of your shredded cheese (1 cup). This mixture transforms the casserole into a creamy, tangy masterpiece.

Step 7: Assemble and Bake

Lightly grease a 9×13-inch baking dish, then transfer your beef and rice mixture into it. Pour the sour cream and cheese mixture all over the top and smooth it out evenly. Sprinkle the rest of your shredded cheese (the final glorious cup) over the surface.

Step 8: Finish Baking

Cover the casserole with foil and bake for 25 minutes. Then remove the foil and continue baking for 10 to 15 minutes, until the cheese is bubbling and golden with those irresistible crispy edges. Let your French Onion Ground Beef and Rice Casserole cool for a few minutes (it’ll be hard to wait!) before serving.

How to Serve French Onion Ground Beef and Rice Casserole

Garnishes

A shower of fresh herbs like chopped parsley or thyme brings color and a touch of brightness to every plate. For a little extra flair, a few crispy fried onions or a sprinkle of cracked black pepper can really drive home those classic flavors.

Side Dishes

French Onion Ground Beef and Rice Casserole is fantastic on its own, but it also loves good company. Pair it with a fresh green salad dressed simply with vinaigrette, roasted green beans, or some garlicky baguette slices for that true French onion soup feel. These sides cut through the richness and round out the meal.

Creative Ways to Present

For family-style, serve straight from the bubbling casserole dish at the center of your table. Want something extra special? Portion individual servings into ramekins before baking for an elegant twist, or top each with mini toast rounds for a nod to classic French onion soup. However you serve it, this casserole is always a show-stopper.

Make Ahead and Storage

Storing Leftovers

Leftover French Onion Ground Beef and Rice Casserole keeps beautifully in an airtight container in the refrigerator for up to four days. The flavors meld and deepen overnight, making reheated portions maybe even better than the first!

Freezing

To freeze, wrap the cooled casserole tightly in plastic wrap and then foil, or place individual servings in freezer-safe containers. Freeze for up to two months. Defrost overnight in the refrigerator before reheating for best results.

Reheating

Reheat the casserole in a preheated 350°F oven, covered with foil, for 20 to 30 minutes or until hot throughout. For single servings, the microwave works well—just heat on medium power in short bursts, stirring in between, until thoroughly warmed.

FAQs

Can I make French Onion Ground Beef and Rice Casserole ahead of time?

Absolutely! Assemble everything up to the point of baking, cover, and store in the fridge for up to 24 hours. When ready, let it sit at room temperature for a bit, then bake as directed—just add a few more minutes to the baking time.

What kind of cheese is best for this casserole?

Shredded Swiss, Gruyère, mozzarella, or even a sharp cheddar all shine in French Onion Ground Beef and Rice Casserole. A mix of two is divine—the choice is yours!

Is there an alternative to dry sherry wine?

If you don’t have sherry, try using a dry white wine or simply sub with a bit more beef broth. The flavor will be slightly different, but the casserole will still be delicious.

Can I use brown rice or a different grain?

For the classic texture, stick with regular white long grain rice—other rice types or grains may need more liquid or a different cook time and could affect the outcome.

What’s the best way to prevent rice from turning mushy?

Be sure to partially cook the rice as directed before baking and don’t overdo the liquid. Covering while baking ensures the steam finishes the rice perfectly without overcooking.

Final Thoughts

There’s something so heartwarming about gathering around the table with a bubbling French Onion Ground Beef and Rice Casserole in the center. Every forkful promises familiar flavors with just enough twist to keep things exciting. Trust me—give this recipe a try once, and it’ll quickly become a cherished favorite in your home too!