Mix the butter, eggs, milk, and dry yeast in a bowl using an electric whisk. Next, add the flour and knead everything into a smooth dough using your hands.
Create three flatbreads from the dough and place mozzarella, cabanossi, and olives on top of each one. Keep back some of the mozzarella for later. Now wrap up the filling in the dough so that it's in the shape of a ball.
Cut the parchment paper into three strips that will fit into the inside of the cans. Add the dough to the cans and bake everything at 350°F for 20 minutes.
In the last step, use a wooden spoon to create holes in the bread. Now pour the cheese sauce into the holes. Sprinkle the rest of the mozzarella on top of each can. Place the cans in an oven set to 400°F with the top heat on for four more minutes.