For the pizza buns, knead flour, dry yeast, salt, oil and lukewarm water in a bowl to make a yeast dough. Let the dough rise for 1/2 hour.
For the filling, chop ham and bacon. Roll out the dough with a rolling pin and spread with ketchup.
Then spread ham, bacon, corn, diced peppers, mushrooms and green onion on top. Finally, sprinkle grated cheese and oregano on top.
Roll up the dough and cut off slices about 2 cm thick and place on a baking tray lined with baking paper. Bake pizza buns at 180 degrees for about 20 to 25 minutes until crispy.