Preheat Oven: Set your oven to 400°F (200°C). Line a baking sheet with parchment paper.
Make the Sauce: In a saucepan over medium heat, combine orange juice, soy sauce, honey, brown sugar, sesame oil, garlic, ginger, rice vinegar, and red pepper flakes. Bring to a simmer.
Thicken the Sauce: Stir in the cornstarch slurry and cook for 1-2 minutes until the sauce thickens. Remove from heat.
Prepare the Salmon: Pat the salmon fillets dry and place them on the prepared baking sheet. Brush generously with the orange teriyaki sauce.
Bake: Place in the oven and bake for 12-15 minutes, basting once halfway through.
Serve: Garnish with sesame seeds and green onions. Serve with rice or steamed veggies. Enjoy!