Add the onion and capsicum into a small bowl before seasoning them with salt, chilli flakes and black pepper. Mix them together.
Butter the bottom part of the bread slices.
Add the tomato sauce onto the bread slices and spread evenly (Now you would have the top part spreaded with tomato sauce, and the bottom spreaded with butter)
Bring back the onion and capsicum and put them on the bread slices.
Add sausages or your other preferred toppings (Pepperoni would definitely be the best one!)
Lastly, sprinkle the mozzarella cheese and dried parsley on top.
Bake in the oven for approximately 15 minutes at 180�C then serve.