Cook your sushi rice according to package directions until tender and sticky. While the rice is still warm, transfer it to a large bowl and add rice vinegar, sugar, and salt. Mix gently with a spatula to combine all the seasonings evenly. Spread the seasoned rice on a baking sheet or large plate in a thin layer. Let it cool to room temperature for about 20 minutes. This cooling step is crucial for the right texture in your spicy salmon sushi bake.

In a large mixing bowl, combine the flaked cooked salmon, softened cream cheese, Kewpie mayo, sriracha sauce, soy sauce, and garlic powder. Mix everything together with a fork or spatula until smooth and creamy. The mixture should be well combined with no large chunks of cream cheese. Taste and adjust the spice level by adding more sriracha if you want it spicier. This spicy salmon mixture is the star of your sushi bake.

Preheat your oven to 375°F and grease a 9x13 inch baking dish with cooking spray or butter. Press the cooled sushi rice firmly and evenly into the bottom of the dish, creating a solid base layer. Use a spatula to pack it down and smooth the top. The rice layer should be compact and even across the entire dish.

Spread the spicy salmon mixture evenly over the rice layer. Use a spatula to cover the rice completely, spreading it all the way to the edges. Make sure the salmon layer is smooth and even so it bakes uniformly. This creates the creamy middle layer of your spicy salmon sushi bake.

Sprinkle the furikake seasoning evenly over the salmon layer. This adds authentic Japanese flavor and a slightly salty, seaweed taste. Cover everything with the shredded mozzarella cheese, making sure to spread it edge to edge. The cheese will melt and create that signature golden bubbly top.

Place the assembled dish in the preheated oven. Bake uncovered for 15 to 20 minutes until the cheese is melted, bubbly, and starting to get golden brown spots on top. The edges should be slightly crispy and pulling away from the sides. Watch it closely in the last few minutes to prevent burning. You want golden, not dark brown.

Remove from the oven and let it rest for 5 minutes so the layers set up slightly. Sprinkle with sesame seeds and sliced green onions. Drizzle with extra sriracha or eel sauce if you want more flavor. Cut into squares for serving.

Serve your spicy salmon sushi bake hot with nori sheets cut into squares on the side. Show guests how to scoop a portion onto a nori sheet and eat it like a hand roll. You can also add toppings like avocado slices, cucumber, pickled ginger, or wasabi. This deconstructed sushi is best enjoyed fresh while the cheese is still gooey.