In a mixing bowl, add White Rice (2 cup), Yellow Onion (1), Cheddar Cheese (1/2 cup), Pink Salmon (400 gram), Frozen Green Peas (2 cup) and Cream of Mushroom Soup (400 gram). Mix together.
Transfer the mixture to a greased baking dish. Scatter Bread (4 slice) over top. Drizzle Butter (50 gram) over bread.
Bake at 200 degrees C (400 degrees F) for 20 minutes, or until golden and crisp on top.