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A close-up of a serving of french onion beef casserole topped with crispy fried onions on a white plate, with the full baking dish blurred in the background.
Maryam

Hearty French Onion Beef Casserole

This comforting French Onion Beef Casserole combines tender beef simmered in a rich, savory broth with deeply caramelized onions, all topped with crusty bread and melted Gruyere cheese for a truly indulgent meal.
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Prep Time 30 minutes
Cook Time 2 hours 30 minutes
Total Time 3 hours
Servings: 6 servings
Course: Main Course
Cuisine: American, French
Calories: 750
Ingredients Equipment Method Notes

Ingredients
  

For the Beef
  • 2 lbs beef chuck roast cut into 1-inch cubes
  • 1 tbsp olive oil
  • 1 tsp salt
  • 1/2 tsp black pepper
  • 2 tbsp all-purpose flour
For the Caramelized Onions
  • 3 lbs yellow onions thinly sliced
  • 2 tbsp unsalted butter
  • 1 tbsp olive oil
  • 1/2 tsp sugar
  • 1/4 tsp salt
For the Broth
  • 4 cups beef broth good quality
  • 1 cup dry red wine such as Merlot or Cabernet Sauvignon (optional, can substitute with more beef broth)
  • 2 tbsp Worcestershire sauce
  • 1 tbsp fresh thyme chopped, or 1 tsp dried
  • 2 bay leaves
For Assembly
  • 6 slices sturdy bread such as sourdough or French baguette, toasted or day-old
  • 8 oz Gruyere cheese shredded
  • 4 oz Provolone cheese shredded (optional, for extra gooeyness)
  • 2 tbsp fresh parsley chopped, for garnish

Equipment

  • Large Dutch oven or oven-safe pot
  • Large skillet (optional, if Dutch oven is smaller)
  • 9x13-inch baking dish
  • Sharp knife
  • Cutting board
  • Measuring cups and spoons
  • Whisk

Method
 

Prepare the Beef
  1. Pat the beef chuck cubes dry with paper towels. Season evenly with 1 tsp salt and 1/2 tsp black pepper.
  2. In a large Dutch oven or oven-safe pot, heat 1 tbsp olive oil over medium-high heat. Dredge the seasoned beef cubes in flour, shaking off excess.
  3. Brown the beef in batches, ensuring not to overcrowd the pot, until nicely seared on all sides, about 3-4 minutes per batch. Remove browned beef to a plate and set aside.
Caramelize the Onions
  1. In the same Dutch oven (or a large skillet if your Dutch oven is smaller), add 2 tbsp butter and 1 tbsp olive oil over medium-low heat. Add the thinly sliced yellow onions, 1/2 tsp sugar, and 1/4 tsp salt.
  2. Cook, stirring occasionally, for 45-60 minutes, or until the onions are deeply golden brown, very soft, and sweet. This process cannot be rushed; low and slow is key.
Build the Casserole Base
  1. Once onions are caramelized, add the dry red wine (if using) to the pot and deglaze, scraping up any browned bits from the bottom. Let it simmer for 2-3 minutes until slightly reduced.
  2. Return the browned beef to the pot with the onions. Stir in the beef broth, Worcestershire sauce, fresh thyme, and bay leaves. Bring to a simmer.
  3. Reduce heat to low, cover, and cook for 1.5 hours, or until the beef is fork-tender. Alternatively, you can braise it in a preheated oven at 325°F (160°C) for 1.5-2 hours.
  4. Remove bay leaves and discard. Taste and adjust seasoning if needed.
Assemble and Bake the Casserole
  1. Preheat oven to 375°F (190°C).
  2. Pour the beef and onion mixture into a 9x13 inch baking dish.
  3. Arrange the toasted or day-old bread slices over the beef and onion mixture. The bread will absorb some of the delicious broth.
  4. Evenly sprinkle the shredded Gruyere cheese (and Provolone if using) over the bread slices.
  5. Bake for 20-25 minutes, or until the cheese is melted, bubbly, and golden brown, and the casserole is heated through. If desired, you can briefly broil for 1-2 minutes at the end for extra browning on the cheese, watching carefully to prevent burning.
Serve
  1. Let the casserole rest for 5-10 minutes before serving. Garnish with fresh chopped parsley. Serve hot.

Notes

For an even richer flavor, you can use homemade beef broth or demi-glace. The red wine adds depth; if omitting, increase beef broth to 5 cups. Don't skip the slow caramelization of the onions; it's essential for the classic French onion flavor. Leftovers can be stored in an airtight container in the refrigerator for up to 3 days. Reheat gently in the oven or microwave.