Preheat the oven to 350°F (175°C).
Rinse the sushi rice under cold water until the water runs clear.
Combine rice and water in a pot; bring to a boil.
Reduce heat, cover, and simmer for 20 minutes until rice is tender.
In a bowl, mix the imitation crab meat, mayonnaise, and sriracha sauce.
Once the rice is cooked, spread it evenly in a baking dish.
Layer the crab mixture over the rice.
Top with sliced avocado and shredded cheese.
Bake in the preheated oven for 25 minutes until cheese is bubbly.
Garnish with nori strips and green onions before serving.