**Cook the Beef:**
In a large skillet over medium heat, cook the ground beef until browned and crumbled. Drain any excess fat. Add the chopped onion and garlic, cooking until softened, about 5 minutes.
**Cook the Rice:**
In a medium saucepan, combine the rice and beef broth. Bring to a boil, then reduce heat, cover, and simmer for 15 minutes, or until the rice is tender and the liquid is absorbed.
**Combine Ingredients:**
In a mixing bowl, stir together the cream of mushroom soup, sour cream, thyme, paprika, salt, and pepper. Add the cooked rice and beef mixture, stirring until well combined.
**Assemble the Casserole:**
Preheat your oven to 350°F (175°C). Spread the beef and rice mixture evenly into a greased 9x13-inch baking dish.
**Add the Topping:**
Sprinkle the shredded cheese evenly over the casserole, followed by the French-fried onions.
**Bake:**
Bake the casserole uncovered for 20-25 minutes, or until the cheese is melted and bubbly.
**Serve:**
Let the casserole cool for 5 minutes before serving.