Cut chicken breast and Spam into small cubes.
Finely chop onion and green onion.
Heat oil in a pan and stir-fry the chicken breast and Spam.
Add onion and green onion, and stir-fry together.
Place the stir-fried ingredients over rice.
Drizzle mayonnaise, soy sauce, and sprinkle pepper.
Top with shredded dried seaweed and chopped scallions as desired to finish.