Steps
1. Preheat your oven to 180°C (350°F).
2. In a skillet, heat olive oil over medium heat and sauté the diced onions until translucent.
3. Add the sliced mushrooms and ground beef, cooking until the beef is browned and the mushrooms are tender.
4. Stir in the cooked rice, cream, and half of the cheese. Season with salt and pepper.
5. Transfer the mixture to a baking dish and sprinkle the remaining cheese on top.
6. Bake in the oven for 15-20 minutes, or until the cheese is bubbly and golden.
7. Serve hot and enjoy your delicious cheesy mushroom and beef rice bake!