01 - Preheat oven to 400°F. Line a baking sheet with parchment paper or lightly grease it.
02 - Pat salmon fillets dry. Drizzle with olive oil and season both sides with salt and pepper. Arrange fillets skin-side down on the prepared baking sheet.
03 - In a small saucepan over medium heat, combine soy sauce, honey, mirin, rice vinegar, brown sugar, sesame oil, garlic, and ginger. Bring to a gentle simmer, stirring until sugar dissolves (about 2-3 minutes).
04 - Stir in the cornstarch-water mixture. Continue cooking for 1-2 minutes, stirring constantly, until the sauce thickens. Remove from heat.
05 - Spoon half the teriyaki glaze over the salmon fillets, reserving the rest.
06 - Bake for 12-15 minutes, or until salmon flakes easily with a fork and is just cooked through.
07 - Transfer salmon to plates. Drizzle with remaining teriyaki glaze. Garnish with sesame seeds and sliced scallions.