In the bowl of a food processor, combine salmon, panko crumbs, onions, mustard, lemon juice, chili powder, parsley, salt and pepper; process until mixture is smooth and combined.
Divide mixture evenly into 4 patties.
Heat an outdoor grill to medium high; about 375F.
When the grill is ready, rub the grates with vegetable oil. (I dip paper towels in vegetable oil and rub across the grate)
Transfer salmon burgers to the grill, close the grill, and cook for 4 minutes.
Flip the burgers and brush with teriyaki sauce.
Close the grill, and cook until the patties are just cooked, about 4 minutes.
Flip again and brush with teriyaki sauce; continue to cook for 1 minute longer.