Season salmon with salt, onion powder, and garlic powder.
Bake at 375°F for about 15 minutes, or until fully cooked.
Cook the sushi rice.
Once cooked, stir in rice vinegar, sugar, and salt. Mix well and let cool slightly.
Shred the imitation crab into a bowl.
Add the baked salmon and flake it apart.
Mix in the cream cheese, Greek yogurt, and Kewpie mayonnaise until well combined.
In an oven-safe baking dish, spread an even layer of rice on the bottom.
Sprinkle with furikake or seaweed flakes.
Spread the salmon and crab mixture on top.
Bake at 375°F for 15 minutes.
Remove from the oven and sprinkle with sesame seeds, green onions, and extra furikake or seaweed flakes.
Drizzle with Kewpie mayo and sriracha.
Serve hot with roasted nori sheets — scoop a portion onto a sheet and enjoy like a sushi taco.