In a large mixing bowl add your diced onions, scallions, minced garlic, soy sauce, coconut milk and ground chicken. Mix with your hands and slowly incorporate the Panko bread crumbs until you have a mixture that will form a palm sized pattie (or slider size). Brush the grates of your grill with some olive oil and cook your patties. Make sure not to turn them too much until you have a nice sear. Since this is chicken you must make sure they're fully cooked (no less than 165 degrees).
I recommend using the Thermapen to check internal temps as a full-proof method for measuring temperature.