Soak the oatmeal in water.
Prepare spicy chicken tuna, cheese, and chopped green onions.
Add the soaked oatmeal and water into a pot and bring to a boil over medium heat.
When the oatmeal becomes soft, add the spicy chicken tuna, cheese, and green onions. Mix well.
Simmer on low heat until the cheese melts.
Serve in a bowl and top with seaweed flakes as desired.