Preheat your 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, then cook according to the manufacturer's instructions.
In a small bowl, mix rice vinegar, sugar, and salt until dissolved.
Once the rice is cooked, fold in the vinegar mixture and let it cool.
In another bowl, combine shredded crab meat, cream cheese, mayonnaise, and sriracha.
Spread the cooled rice evenly in a greased baking dish.
Layer the crab mixture on top of the rice.
Sprinkle shredded cheese over the crab layer.
Bake for 20-25 minutes until the top is bubbly and golden.
Remove from the oven and top with sliced avocado before serving.