Preheat the oven to 350°F. Place flatbread in a single layer on parchment-lined sheet pans.
Pour 1 tablespoon of the Kikkoman Low Sodium Gluten-Free Sweet & Sour Sauce into the center of each flatbread and spread the sauce evenly toward the edges.
Sprinkle 1 ounce of mozzarella cheese evenly over the sauce on each flatbread.
Top with 1.25 ounces of diced chicken and 1 tablespoon of sliced green onion. Bake in a preheated 350°F oven for about 10 minutes; just until the cheese bubbles and begins to brown slightly.
CCP: Heat to a minimum internal temperature of 135°F.
Remove from the oven.
CCP: Hold hot at 135°F or higher.
Just before serving sprinkle each flatbread with 1 tablespoon chopped fresh cilantro.