What is this Italian dish it a bread made with sausage fried onions olives and parmesan cheese?

The dish you are describing is most likely Focaccia with Sausage, Onions, Olives, and Parmesan Cheese.

Focaccia is a flat Italian bread that is often topped with various ingredients. The combination of sausage, onions, olives, and parmesan cheese is a popular and flavorful topping option.

It's also possible that the dish you had is a variation of a Pizza Bianca, which is a white pizza with no tomato sauce, but often topped with various savory ingredients.

Regardless of the exact name, it sounds delicious!