Cream the butter with the eggs. Sift the flour and mix with the salt, pizza spices and baking powder. Alternately add some flour and some milk to the dough until no flour is left.
Drain the tomatoes a little and, like the salami, the ham and the peppers, cut them into small cubes and add them to the dough. Cut the cheese also into cubes and stir into the dough. Do not fill the baking cups completely with dough.
Bake the muffins at 200°C (preheated) for about 20 minutes.