Preheat the oven to 375°F (190°C).
Place the flatbreads on a baking sheet.
In a bowl, toss shredded chicken with Buffalo sauce.
Spread the chicken mixture evenly over the flatbreads.
Top with shredded mozzarella cheese.
Bake for 10-12 minutes or until the cheese is melted and bubbly.
Drizzle ranch dressing over the baked flatbreads.
Garnish with chopped green onions and serve warm.