In a small bowl, whisk together cornstarch and ¼ cup water; set aside.
In a small saucepan over medium heat, add soy sauce, brown sugar, ginger, garlic powder, honey and 1 cup water; bring to a simmer.
Stir in cornstarch mixture until thickened enough to coat the back of a spoon, about 2 minutes; let cool to room temperature.
In a gallon size Ziploc bag or large bowl, combine teriyaki marinade and salmon filets; marinate for at least 30 minutes to overnight, turning the bag occasionally.
Preheat oven to 400 degrees F. Lightly coat a 9 x 13 baking dish with nonstick spray.
Place salmon filets with the marinade into the prepared baking dish, and bake until the fish flakes easily with a fork, about 20 minutes.
Serve salmon immediately with Sriracha cream sauce.
In a small bowl, whisk together mayonnaise, 2 tablespoons Sriracha and condensed milk.