Rinse sushi rice under cold water until the water runs clear. Combine the rice and water in a rice cooker and cook according to the rice cooker instructions. Once done, let it sit for 10 minutes.
In a small saucepan over low heat, combine rice vinegar, sugar, and salt. Stir until dissolved. Gently fold this mixture into the cooked rice to season it. Spread the rice out on a baking sheet to cool.
Preheat your oven to 400°F (200°C). In a mixing bowl, combine the salmon, sriracha, mayonnaise, soy sauce, and sesame oil. Use a fork to flake the salmon and mix until well combined.
In a baking dish, spread the seasoned sushi rice evenly at the bottom. Top the rice with the spicy salmon mixture, spreading it out evenly.
Place the baking dish in the preheated oven and bake for about 15-20 minutes until the salmon is cooked through and the top is slightly golden.
Remove the dish from the oven and top with sliced avocado, chopped green onions, and a sprinkle of sesame seeds.
Cut the sushi bake into squares and serve with nori squares on the side for wrapping. Offer pickled ginger and wasabi on the side for an added zing.