Preheat the oven to 425 degrees F (220 degrees C).
Spread marinara sauce on the entire surface of the flatbread. Evenly distribute spinach over marinara sauce, followed by pineapple, bell pepper, olives, ham, and green onions. Sprinkle cheese on top.
Bake in the preheated oven until crust is crispy and cheese has melted, 10 to 15 minutes.