In a large bowl, combine the ground chicken, sour cream, breadcrumbs, chives, garlic, salt, black pepper, mustard, and hot sauce (if using). Mix gently to combine well. Divide the mixture into 6 even portions (about 6 ounces each). Pat together into a ball, then press into a patty, about ¾-inch thick. Place the patties on small squares of parchment or waxed paper to make it easier for transferring to the grill. Cook until the internal temperature of the burger reaches 165˚, about 4 to 5 minutes per side.
