Crumble the yeast and mix with the salt until it becomes liquid. Put in a mixing bowl and mix with the flour, oil and water to form a dough. Cover the yeast dough and let rise in a warm place for about 25 minutes (until it has enlarged significantly).
Add the ham cubes, fried onions and cheese and mix with the batter. Spread the mixture thinly on a greased baking sheet.
Bake in the preheated oven at 200 ° C on the middle rack for about 20 minutes.