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French Onion Rice Casserole

French Onion Rice Casserole

This French onion rice casserole combines the rich flavors of caramelized onions and savory beef broth with tender rice and melty cheese, creating a cozy and satisfying dish perfect for family gatherings or potlucks.
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Prep Time 20 minutes
Cook Time 45 minutes
Total Time 1 hour 5 minutes
Servings: 8 servings servings
Course: Main Course
Cuisine: French
Calories: 285
Ingredients Method Notes

Ingredients
  

  • 1½ cups long-grain white rice (uncooked)
  • 3 large yellow onions (thinly sliced)
  • 4 tablespoons unsalted butter
  • 3 cups beef broth
  • 1 tablespoon Worcestershire sauce
  • 1 teaspoon fresh thyme leaves
  • 1½ cups Gruyère cheese (shredded)
  • ½ cup mozzarella cheese (shredded)
  • ½ teaspoon salt
  • ¼ teaspoon black pepper
  • ½ teaspoon garlic powder

Method
 

  1. Preheat your oven to 375°F and grease a 9x13-inch baking dish.
  2. In a large skillet over medium heat, melt the butter and add the sliced onions with a pinch of salt. Cook slowly for about 25-30 minutes until golden brown.
  3. In a large mixing bowl, combine the uncooked rice, beef broth, Worcestershire sauce, thyme, garlic powder, salt, and pepper. Stir until well blended.
  4. Add the caramelized onions to the rice mixture and stir to combine. Pour into the prepared baking dish.
  5. Cover the baking dish tightly with aluminum foil and bake for 45 minutes.
  6. After 45 minutes, remove the foil, sprinkle the Gruyère and mozzarella cheeses on top, and bake uncovered for another 10-15 minutes until the cheese is melted and bubbly.
  7. Let the casserole rest for about 5 minutes before serving.

Notes

Make ahead by assembling the casserole up to 24 hours in advance. Store leftovers in an airtight container for up to 4 days.