Preheat oven to 400 degrees.
In a saucepan on medium heat combine the chicken and 1tbsp of buffalo sauce. Mix until fully combined and the chicken it warm.
Place the flatbread on a baking sheet.
In a small bowl mix the ranch and buffalo sauce together. Spread the mixture onto teh flatbread.
Sprinkle the mozzarella and cheddar cheese on top.
Spread the buffalo chicken across the flatbread with any remaining cheese.
Baked in the oven for 8-10 minutes ir until the cheese has melted.
Top with remaining sauce.