Preheat the oven to 375°F (190°C).
Heat olive oil in a skillet over medium heat. Add diced onion and cook until soft, about 4 minutes.
Add garlic and stir for 30 seconds. Toss in the ground beef and cook until browned.
Drain any excess fat and stir in salt, pepper, and paprika.
Mix in the sour cream, cream of mushroom soup, and cooked rice. Fold in 1 cup of the shredded cheddar.
Transfer the mixture into a greased baking dish. Sprinkle the remaining 1/2 cup cheddar evenly on top.
Bake for 20–25 minutes, until the cheese is melted and starts to get crispy around the edges.
Let it cool a bit before serving—if you can wait.