Cook rice according to package directions (you’ll need 3 cups cooked).

In a skillet, brown the ground beef over medium heat, breaking it up as it cooks. Drain excess grease.

In a large bowl, combine cooked beef, cooked rice, French onion soup, sour cream, half the cheese, and seasonings. Mix thoroughly.

Spread mixture evenly in a greased 9×13-inch baking dish.

Sprinkle remaining cheese over top.

Caramelize onions in butter and olive oil until golden, then spoon them over the casserole.

Bake uncovered at 350°F (175°C) for 25-30 minutes until bubbly.

Let rest for 5 minutes before serving.