Pour the flour into a bowl and make a depression in the middle. Crumble yeast into it. Pour in about 300 ml of lukewarm water. Mix with some flour from the edge to a pre-dough. Cover and leave to rise in a warm place for about 30 minutes.
In the meantime, finely grate the parmesan and pecorino. Crush the gorgonzola a little. Drain mozzarella and dice. Mix all cheeses. Add 4 tablespoons of oil to the pre-dough. Knead everything to a smooth dough.
Let it go for another 15 minutes. Peel garlic and cut into thin slices. Grease baking tray. Roll out the dough on a floured work surface and place on the baking tray. Spread the cheese evenly on top.
Add the garlic. Cover with sage leaves and sprinkle with remaining olive oil. Bake in the preheated oven (electric cooker: 225 ° C/ gas: level 4) for about 40 minutes.