Preheat the oven to broil and position the oven rack to the top rack. Line a baking sheet with foil and spray with non stick cooking spray. Place the salmon filets skin side down on the prepared baking sheet, set aside.
In a small saucepan combine soy sauce, vinegar, sugar, thai chili sauce, garlic and cornstarch. Bring to a simmer and whisk constantly until the sauce has thickened.
Brush half of the sauce on top the salmon filets. Place in the oven and broil for 8-10 minutes or until the salmon is fully cooked, brushing the remaining sauce on top halfway through cooking. If the salmon starts to get too brown move the rack down some.
Once the salmon has cooled a bit remove the skin and serve immediately with green onions and sesame seeds for garnish, if desired.