Rinse the sushi rice under cold water until the water runs clear. In a pot, combine the rice and water, bring it to a boil, then reduce to a simmer, cover, and cook for 15 minutes, or until the water is absorbed. Remove from heat and let it sit for 10 minutes.
In a small bowl, mix the rice vinegar, sugar, and salt until dissolved. Gently fold this mixture into the cooked rice, ensuring not to mash the grains. Set aside.
In a mixing bowl, combine the shredded imitation crab meat, softened cream cheese, mayonnaise, sriracha, and chopped green onions. Mix well until all ingredients are incorporated.
In a greased baking dish (approximately 9x9 inches), spread the seasoned sushi rice evenly on the bottom. Layer the crab mixture over the rice, spreading it out evenly.
Place the baking dish in the preheated oven and bake for 20-25 minutes, or until the top is lightly golden and bubbly.
Remove from the oven and garnish with nori strips and a sprinkle of sesame seeds. Allow to cool for a few minutes before slicing into squares.
Serve the sushi bake warm with soy sauce on the side for dipping.