Savory French onion–inspired casserole with ground beef, tender rice, caramelized onions, and melty cheese—comforting and hearty.

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Preheat oven to 350 °F (175 °C). Grease a 9×13‑inch baking dish.
In a skillet over medium heat, melt butter with olive oil. Add sliced onions and cook, stirring often, until caramelized and golden, about 15–20 minutes.
Add ground beef to skillet; cook until browned, breaking it apart. Drain excess fat.
Stir in garlic powder, Worcestershire sauce, salt, and pepper; cook 1–2 minutes.
Mix in French onion soup and beef broth; simmer briefly until combined.
Remove from heat and stir in cooked rice until evenly coated.
Transfer mixture into prepared baking dish and smooth top.
Sprinkle shredded cheese evenly over the casserole.
Bake uncovered for 20–25 minutes until cheese is melted and bubbly.
Let rest 5 minutes before serving to allow casserole to set.

Use Gruyère for a richer, slightly nutty flavor.
Add mushrooms or green peas for extra veggies.
Make ahead: assemble and refrigerate (covered) up to 24 hours; add 5–10 min to bake time.
Leftovers store covered in fridge for up to 3 days; reheat in oven or microwave.
Top with fresh parsley before serving for color.