Preheat your oven to 375°F (190°C).
In a bowl, combine the softened cream cheese, mayonnaise, soy sauce, and sriracha. Mix until smooth and well incorporated.
Gently fold in the cooked sushi rice, diced cucumber, and chopped green onions into the cream cheese mixture.
Spread half of this mixture evenly in a baking dish.
Layer the bite-sized salmon cubes on top of the rice mixture.
Spread the remaining rice mixture over the salmon, ensuring even coverage.
Sprinkle black sesame seeds over the top for added texture and visual appeal.
Place aluminum foil over the baking dish and bake in the preheated oven for 20 minutes.
After 20 minutes, take off the foil and continue baking for an extra 10 minutes, or until the top turns a delicate golden hue.
Once baked, let the dish rest for a few minutes before serving.