Sprinkle thin slices of cooked Italian sausage or other pre-cooked meat on top of the cheese. Add the roasted vegetables to the pizza. Season the flatbread with fresh oregano or other herbs, if desired. Cook the flatbread pizza in a 450 degree F oven until the crust is golden brown, approximately 10 minutes.Cut larger flatbread pizzas into easy-to-handle squares. Serve pizza immediately while it's still hot.prinkle thin slices of cooked Italian sausage or other pre-cooked meat on top of the cheese. Add the roasted vegetables to the pizza. Season the flatbread with fresh oregano or other herbs, if desired. Cook the flatbread pizza in a 450 degree F oven until the crust is golden brown, approximately 10 minutes.