Preheat the oven to 350 F. Line a baking sheet with parchment paper.

Place the salmon on the sheet tray, and coat with the oil. Bake for 15 minutes, until flaky. Remove from the oven, and shred it with a fork.

Place the salmon in a bowl with the soy sauce and 2 tablespoons mayo. Combine well, then set aside.

While the salmon bakes, prepare the rice. Bring the rinsed rice and water to a boil in a saucepan, then lower the heat to low, and cover. Cook until fluffy, and the water is absorbed, about 15 minutes, then remove it from the heat.

Whisk the vinegar, sugar, and salt together in a medium-sized bowl. Add the cooked rice and everything bagel seasoning, and combine.

Press the seasoned rice into a 9-x11-inch or smaller baking dish. Press the saucy salmon on top of the rice. Drizzle the remaining 2 tablespoons mayo and sriracha on top to coat. Sprinkle the sesame seeds on top.

Bake for 20 minutes. Remove the sushi bake from the oven, and sprinkle with chopped scallions. Serve with sheets of nori.