Clean the tomatoes, peppers, zucchini, onions, cloves of garlic and mushrooms and cut into pieces that are not too small. Put all the vegetables in a bowl and season well with salt, pepper and oregano. Mix with about 2-3 tablespoons of olive oil.
Roll out the puff pastry into a sheet that fits on a baking sheet. Preheat the oven to 200 °.
Place the puff pastry on the baking sheet, distribute the ketchup and mustard evenly on top. Pour the vegetables on top and distribute them evenly, leaving a small edge.
Spread the cheese on the vegetables and sprinkle with olive oil. Leave the pizza in the oven for about 30-40 minutes at 150 ° C, between the bottom and the middle rail. You can of course top the pizza with ham, salami or whatever you want