Prepare the dough: dissolve the yeast in warm water (35-37°C) and leave it for 10 minutes. Add vegetable oil to the liquid.
Pour flour into the liquid, add a teaspoon of salt and sugar. Knead the dough and leave in a warm place for 20-30 minutes.
Make a thin disk from the dough, rolling it out to a diameter of 25-30 cm. Grease the base with tomato paste and place on a baking sheet, arrange the champignons and salami. Sprinkle grated cheeses evenly on top and put in the oven for 15 minutes.
When the dough is golden brown, remove the pizza and cut into slices.