Preheat the oven to 350°F (175°C).
Rinse the sushi rice under cold water until the water runs clear.
In a rice cooker, combine the rinsed rice and water; cook according to the manufacturer's instructions.
Once cooked, let the rice cool slightly, then mix in rice vinegar, sugar, and salt.
In a bowl, combine chopped imitation crab, mayonnaise, and cream cheese.
Spread the sushi rice evenly in a greased baking dish.
Layer the crab mixture over the rice.
Top with sliced avocado and sprinkle with green onions.
Evenly distribute shredded cheese on top.
Bake for 20-25 minutes until the top is golden and bubbly.