Combine onion, garlic, ginger and chile in a food processor and pulse until finely chopped. Add chicken, cilantro and fish sauce and pulse until well blended but not quite pureed. Transfer to a bowl and stir in egg whites and bread crumbs.
Heat broiler to high with rack 4 inches from heat. Line 2 baking sheets with foil and lightly coat with cooking spray. Coat hands with cooking spray and shape 24 patties, about ½ inch thick; place on baking sheets.
Broil each batch until patties are lightly browned, about 4 min, then turn patties over and broil 4 min more.Swerve with chili sauce and lime wedges.
Sweet chili sauce is made from red chiles, spices, vinegar and sugar. It's great on my chicken patties, but also try it on seafood or in place of ketchup on burgers. You'll be hooked!