Prepare the top rack of your oven so it's 8" from the bottom of the broiler, and preheat your oven to 400 F.
Whisk together the soy sauce, avocado oil, sriracha, brown sugar, ginger, garlic, and red pepper flakes. Set aside a few tablespoons (to use as a sauce later!).
Pat salmon completely dry, and place it on a rimmed baking sheet, option to line with foil for easy clean up. Drizzle with sauce. Place a sheet of foil on top and tent the salmon, this helps to trap moisture and keep the fish moist.
Bake in preheated oven on the top rack until the salmon is almost cooked through in the center, about 14 minutes. Remove the top sheet of foil, and crank your oven to broil. Continue to broil until the sugar caramelizes along the surface of the salmon, and the salmon cooks through, about 2-3 minutes.
Remove from the oven and sprinkle with sesame seeds and green onions. Enjoy!