Finely chop rice, vegetables, and ham.
In a bowl, mix rice, vegetables, ham, salt, pepper, and mayonnaise.
Add oil to a pan and spread the rice mixture into a round shape.
Cook over low heat until the bottom is golden and flip it over.
Top with tomato sauce, pizza cheese, and your desired toppings.
Cover the pan and cook until the cheese is melted.
Transfer the finished rice pizza to a plate.