For the ham and mushroom pizza, roll out the pizza dough. Spread ketchup on dough and top with ham.
Spread corn, mushrooms, onion rings on top. Finally, place mozzarella slices on top and sprinkle with oregano.
Bake at 200 degrees until cheese is golden brown. Garnish the ham and mushroom pizza with fresh basil and serve.
Instead of ketchup, you can use canned tomatoes for the ham and mushroom pizza.