Preheat your oven to the highest heat possible.
Form the pizza dough into a ball. Start by making a circular motion with the palm of your hand, applying some pressure. Then release the pressure gradually until you get a nice ball shape. Put your pizza dough balls on a lightly floured work surface. Dust them with some more flour, and let them proof, covered with a kitchen towel, for another 15 minutes.
Shape each dough ball into a large, thin disk and place it in a pizza pan.
Put the tomato purée (passata) on top of the pizza dough, in the middle. With the back of a spoon or a ladle, using circular motions toward the edges, make sure the tomato covers your pizza dough. Leave an edge about 1 inch (2-3 cm) wide.
Drizzle a few drops of extra virgin olive oil and sprinkle with some dried oregano and salt.
Add mozzarella cheese. Just tear it into bite-size pieces, and place them over the tomato sauce.
Cut the mushrooms into 1/4-1/5 inch (5-6 mm) slices and the artichoke hearts into 8 pieces. Tear your ham into bite-size pieces.
Put all the toppings on your pizza: ham, mushrooms, artichokes, and olives. It is called capricciosa (capricious) because all these different toppings go together, so just don’t worry about arranging them.
Transfer the pizza capricciosa to the oven. Bake for 10 minutes, or until the edges are slightly browned.