Preheat your oven to 400°F (200°C).

Rinse the sushi rice under cold water until the water runs clear. Combine the rice and water in a rice cooker or pot, and cook according to package instructions.

Once the rice is cooked, transfer it to a large bowl. In a small saucepan, heat the rice vinegar, sugar, and salt over low heat until dissolved. Pour this mixture over the warm rice and gently fold to combine. Let the rice cool slightly.

While the rice is cooling, prepare the salmon. In a medium bowl, flake the salmon with a fork. Add the mayonnaise, sriracha, and soy sauce, mixing until well combined.

In a greased 9x13 inch baking dish, spread the sushi rice evenly across the bottom. Top with the spicy salmon mixture, spreading it evenly over the rice.

Bake in the preheated oven for 15-20 minutes, or until the top is slightly golden and heated through.

Remove from the oven and let cool for a few minutes. Top with sliced avocado, chopped green onions, and nori strips. Sprinkle sesame seeds on top for garnish.

Serve warm, and enjoy your sushi bake!