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French Onion Ground Beef and Rice Casserole finished recipe

French Onion Ground Beef and Rice Casserole

This oven-baked meal is easy to prepare ahead and reheats well, making it a practical choice for busy weeknights or casual gatherings.
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Prep Time 20 minutes
Cook Time 50 minutes
Total Time 1 hour 20 minutes
Servings: 9 servings
Ingredients Method Notes

Ingredients
  

For the Rice
  • 1 cup uncooked long-grain white rice
  • 2 cups water
  • 1/2 teaspoon fine sea salt
For the Beef Mixture
  • 1 tablespoon olive oil
  • 2 large yellow onions
  • 1 pound lean ground beef
  • 3 medium garlic cloves
  • 1 teaspoon Worcestershire sauce
  • 1 teaspoon dried thyme
  • 1/2 teaspoon onion powder
  • 1/2 teaspoon ground black pepper
  • 1/2 teaspoon fine sea salt
For the Sauce
  • 1 tablespoon all-purpose flour
  • 1 1/2 cups low-sodium beef broth
  • 1/2 cup sour cream
  • 1 teaspoon Dijon mustard
For the Topping
  • 1 cup shredded Gruyère cheese
  • 1 cup shredded low-moisture mozzarella cheese
  • 1 tablespoon chopped fresh parsley optional

Method
 

Method
  1. Refrigerate leftovers within 2 hours in an airtight container for up to 4 days. Reheat covered in a 350°F (175°C) oven for 20 to 25 minutes, or microwave individual portions until they reach 165°F (74°C).

Notes

For the best flavor, be sure to caramelize the onions thoroughly. This step enhances the sweetness and depth of the dish.

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