Pour the flour into a bowl and make a depression in the middle. Crumble yeast into it. Pour in about 200 ml of lukewarm water. Mix with some flour to a pre-dough. Cover and leave to rise for about 30 minutes.
Drain the cheese and cut into slices. Clean, wash and slice the tomatoes and mushrooms. Add oil to the pre-dough and knead everything into a smooth dough. Leave to rise for another 15 minutes.
Spice the strained tomatoes with salt, pepper and thyme. Grease the pizza form (approx. 30 cm Ø). Roll out the dough on a floured work surface to the size of the mould and place it inside. Spread the dough with tomato puree.
Spread cheese, mushrooms and tomatoes on top. Bake in the preheated oven (electric cooker: 225 ° C/ gas: level 4) for about 30 minutes. Add Parma ham and olives 5 minutes before the end of the cooking time. Garnish with thyme.