Prepare: Rinse the rice under cold water until the water runs clear, then drain.
Cook rice: In a saucepan, bring water to a boil, then add the rice and simmer until tender and water is absorbed.
Cook mushrooms: While rice is cooking, heat olive oil in a frying pan. Add mushrooms and cook until browned and tender.
Combine: Once rice is cooked, incorporate the sauteed mushrooms and grated cheese. Stir well until cheese is melted and mixture is well combined.
Season: Finally, season with salt and black pepper to taste. Mix well and remove from heat.
Serve: Serve the Mediterranean Rice with Cheese and Mushrooms warm, garnish with fresh herbs if desired.