01 - Preheat oven to 400°F. Line a 9x13-inch baking dish with parchment paper or grease lightly.
02 - Rinse sushi rice under cold water until water is clear. Combine rice and water in a saucepan, bring to a boil, reduce heat, cover, and simmer for 18 minutes. Remove from heat and let stand for 10 minutes.
03 - In a small bowl, dissolve rice vinegar, sugar, and salt. Gently fold mixture into hot rice and allow to cool slightly.
04 - Arrange salmon fillet on a baking sheet, brush with olive oil, and bake for 12 to 15 minutes until just cooked through. Flake with a fork and let cool briefly.
05 - Mix flaked salmon, mayonnaise, sriracha, soy sauce, sesame oil, and sliced green onions in a mixing bowl until fully integrated.
06 - Spread seasoned sushi rice evenly in the prepared baking dish and sprinkle with furikake seasoning.
07 - Evenly distribute the salmon mixture over the rice layer.
08 - Scatter nori strips, additional furikake, and toasted sesame seeds atop the salmon mixture.
09 - Return the dish to the oven and bake for 10 to 12 minutes, until heated through and lightly golden.
10 - Remove from oven and drizzle with additional sriracha and mayonnaise. Garnish with avocado slices if desired. Serve warm with extra nori sheets for scooping.