A lot of hotels offer an American breakfast, sometimes for an extra charge, which will include eggs and sausage or bacon. Most regular hotel breakfasts had a variety of cured meats, prosciutto or ham, and sometimes boiled eggs in addition to the pastries and fruits.
I'm sure it depends on where you go, but we didn't see a lot of butter while we were there, everything was prepared with olive oil. The few times I ordered a salad, it was served with no dressing, just a bottle of olive oil and a bottle of vinegar, so that will be easy for you! And honestly, the bread was not that amazing for me, but the pasta was out of this world. If you are going to splurge on some gluten, I'd save it for the pasta! Enjoy your trip!