Preheat to 450 degrees. In a large bowl, combine turkey, oregano, basil, garlic powder, and onion flakes. Mix well and shape into 8 patties. Place patties in a shallow baking pan that has been sprayed with a nonstick cooking spray. Bake 15 minutes, until burgers are no longer pink inside, turning once while cooking. While burgers are cooking, prepare sauce: Combine all sauce ingredients in a small saucepan. Heat over medium heat until mixture boils. Remove from heat. Spoon mixture evenly over burgers. Return to oven for 5 minutes. Spoon sauce over burgers when serving.