Preheat your oven to 400°F (200°C).
Rinse the sushi rice under cold water until the water runs clear. Combine the rinsed rice and water in a rice cooker or pot. Cook according to the rice cooker instructions or bring to a boil, then reduce heat to low, cover, and simmer for 20 minutes.
In a small bowl, mix the rice vinegar, sugar, and salt until dissolved. Once the rice is cooked, transfer it to a large bowl and gently fold in the vinegar mixture. Allow the rice to cool slightly.
In another bowl, combine the flaked salmon, mayonnaise, and sriracha. Mix until well combined.
In a greased 9x13 inch baking dish, spread the sushi rice evenly across the bottom.
Layer the salmon mixture over the rice, spreading it evenly.
Bake in the preheated oven for 15-20 minutes, or until heated through and slightly golden on top.
Remove from the oven and let it cool for a few minutes. Top with sliced avocado and sprinkle with chopped green onions and nori strips.
Serve warm with soy sauce on the side for dipping.